BRS GFO & Carbon Reactor - Dual

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Quick Overview

Easy to use, setup and maintain. Perfect for utilizing GFO and Carbon in the aquarium. No annoying thumb screws and leaky lids like other reactors. BRS recommends a Cobalt Aquatics MJ1200 pump to operate this reactor. Sold separately or packaged with the pump. Choose a different pump depending on mounting height and amount of media used. Not for use with biopellet media.
  • Quick Overview
Easy to use, setup and maintain. Perfect for utilizing GFO and Carbon in the aquarium. No annoying thumb screws and leaky lids like other reactors. BRS recommends a Cobalt Aquatics MJ1200 pump to operate this reactor. Sold separately or packaged with the pump. Choose a different pump depending on mounting height and amount of media used. Not for use with biopellet media.

BRS GFO & Carbon Reactor - Dual

96% Recommend this to a friend (372 of 388)

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BRS GFO & Carbon Reactor - Dual
SKU: 204181

reg. $64.99

Special Price: $55.24

BRS GFO & Carbon Reactor - Dual with MJ1200 Pump
SKU: 300181

reg. $94.99

Special Price: $80.74


Full Details

The Dual BRS GFO and Carbon Reactor features several distinct advantages over other brands.

  • Ultra-transparent media cartridge allows for clear viewing of reactor media
  • Heavy duty plastic construction.
  • 1/2" Push Connect fittings and ports throughout reduce head pressure and provide ample flow rates.
  • High quality easy to use double O-Ring push- connect fittings.
  • Easy to operate, clean and maintain.
  • High quality ball valve for precise tuning.
  • Ability to run carbon and GFO at the same time.
  • Instantly attaches to popular pumps like Maxi Jets using included push connect fittings.
  • (2) 3 Ft. sections of tubing
  • Holds three cups of carbon (Aprox. 300g) or two cups of GFO (Aprox 290g) per canister
  • Not for use with Biopellet Media
  • Dimensions: 14.5"H x 14"W x 5.25"
  • Pump (optional) and media sold separately


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  • Great product By Adam on 10/19/2017

    Follow the directions and you won’t have issues. Purchase the silicone hose kit if your sump lacks space.
  • ***MUST HAVE*** By FLSharkvictim on 10/14/2017

    Anyone setting up a NEW tank OR maintaining one must have a BRS DUAL reactor. I run ROWAPHOS & BRS ROX 0.8 CARBON... HIGHLY RECOMMENDED!
  • Mandatory Filtration By Brenton on 9/16/2017

    This has become the backbone of my filtration, which is why I have three. I know everyone says that a protein skimmer is the essential filtration component but I disagree. I fill the first canister with aquamaxx 50 & 100 micron pads and then the second with carbon. It increases the life of the carbon and cleans the water so well. This system makes it easy. Durable too. Multiple ways to rig it up as well as far as pumps. Hard to daisy chain though because there is no straight connector on exit. Probably end up with a fourth sometime soon.
  • Very reliable and long lasting By Bakerrichard27 on 9/1/2017

    I have had these for 6 years love them perform quarterly mainly and you will never have issues
  • Weak pump By Jtl on 8/7/2017

    The MJ 1200 pump is too weak to put enough flow through the dual reactors. Even wide open I could only get the very top of the GFO to tumble when using carbon in the other reactor. I had to remove some of the GFO and run wide open without anything in the other get it to work.
  • Bracket should be metal By Bobby on 6/15/2017

    The reactor is good quality, and the connections are leak free. I especially like the ease of media changes due to the cartridge. However, the bracket should be either metal or more sturdy plastic. It bends doing nothing more than hanging on a mounted position. Please make the bracket metal. This is enough of an issue for me to remove two stars on an otherwise five star product.
  • I am LOVING IT By Dory on 6/10/2017

    My reactor is running for a month now on a 125g tank and quickly reduced my phosphates to sero! Installation was easy and the plastic mount does the job so far. However, I think steel or some other kind of metal would be better, it feels a bit weak when changing the medium. Overall I am very happy with it and would definitely recommend it.
  • Easy for beginners By Douglas on 5/31/2017

    Tank up and running for about 3 months now and long hair algea blooms have been out of controll. Installed brs dual reactor about one week ago and water is noticeably clearer and phosphates are finally under control. No signs of any new algea blooms!!! Thanks brs videos!!!
  • PERFECT By PETRO on 5/19/2017

  • It works well By Tim on 5/12/2017

    I tried a few reactors before this one and, therefore, knew what I didn't like. Primarily the uneven tumbling of GFO and the difficulty of changing the media. The BRS reactor solved both of these problems. I get even tumbling, even at low flow rates and the media is 10 times easier than my previous reactors.
  • Good reactor. By Terry on 4/13/2017

    The mount for the reactor should be metal. Connections should be clamped so it's less likely to develop a leak.
  • Great Product By steve on 3/29/2017

    Just getting setup great service as always! Love the videos! Thanks for the help.


Ask a question

Product Questions

Would running one of these types of reactors be overkill on a Biocube29? Im wanting to run both GFO and Carbon and dont think the innovative marine will do so. Would also like something that I can use when i upgrade to a 90 this spring.
Question by: Chris on Dec 20, 2013 4:05:00 PM
Hey Chris,
Thats not an issue. The chambers may look a little empty with the amount of media you use for a tank that size but it won't hurt anything and youll have it for your big tank this spring.
Answer by: Bulk Reef Supply on Dec 20, 2013 4:05:00 PM
What's the best way to connect a pump to the reactor? I have an extra Maxi jet 1200 I thought I'd use, but the outlet is exactly the same size as the tubing for the reactor and the ½" reactor tubing won't stretch to fit over it.
Question by: Patrick on Dec 3, 2013 5:18:00 AM
Hey Patrick,
All it takes is a 1/2" push connect union which the reactors themselves come with. Otherwise I have them linked below as well.
Answer by: Bulk Reef Supply on Dec 3, 2013 5:18:00 AM
Considering a brs carbon and gfo dual reactor. What is the gfo component and what does it do. Thanks brs team you guys rock
Question by: John on Nov 27, 2013 3:00:00 AM
Hey John,
GFO stands for Granular Ferric Oxide and it is a phosphate remover. Its actually one of the few effective ways of removing phosphate from the tank which is pretty important as its not only an algae food, but it also inhibits the growth of stony corals as well. Here is a short video we did on GFO
Answer by: Bulk Reef Supply on Nov 27, 2013 3:00:00 AM
which replacement pads should I purchase for this reactor ?
Question by: Guy on Sep 26, 2013 2:32:00 PM
Hey Guy,
You would want to use these replacement filter pads:
Answer by: Bulk Reef Supply on Sep 26, 2013 2:32:00 PM
what is this used for
Question by: angelo on Apr 11, 2014 6:09:00 PM
It is generally used for GFO and carbon, though folks use it for other types of media.
Answer by: Bulk Reef Supply on Apr 11, 2014 6:09:00 PM
Looking to buy a couple of the ball valves included with this reactor. I don't see them listed separately on the site.
Question by: Lance on Oct 2, 2013 4:42:00 PM
Hi Lance,
They are 1/2" inline ball valves. They can be found right here:
Answer by: Bulk Reef Supply on Oct 2, 2013 4:42:00 PM
I will be upgrading my tiny 14 gallon tank to a nice 50 gallon soon. Is this product recommended for a brand new tank?
Question by: Hank on Mar 23, 2014 8:13:00 PM
Hi Hank,
I would suggest running GFO and carbon on any tank, even better if its a new tank as you can help keep it in good shape rather then trying to to recover after things get out of hand.
Answer by: Bulk Reef Supply on Mar 23, 2014 8:13:00 PM
What kind of flow should this unit be pushing (gph)? I've got about 300gallons of total water volume and am sitting at about 56gph through the reactor. I've got about 1.5 cups of GFO and Carbon now, as I didn't want to pack them any higher even though they are noted to hold 2 cups. GFO wouldn't be able to tumble based on what it looks like.
Question by: LogTech on Dec 2, 2016 8:26:00 AM
Great question! Flow rating will be dependent on how much media is needed for tank water volume. Although there is no minimum/maximum GPH rating for these, the proper flow will be determined by the tumbling of the GFO. As long as your GFO is lightly tumbling, you have the proper GPH. :-)
Answer by: Randy (Admin) on Dec 2, 2016 8:48:00 AM
Hello there I would like to know that.can I use dual go and carbon reactor for my freshwater refugium sump and what type media it should use.thank for helping me.
Question by: phuoc nguyen on Mar 28, 2016 6:00:00 PM
Great question!
You certainly can use the reactor and Carbon and GFO with a freshwater tank! Any of the Carbon and GFO supplements will work great at clarifying the water and removing phosphate. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 29, 2016 2:51:00 PM
Will the MJ-1200 be able to push water down 30inches, through the reactors, then up 30inches? Just want to make sure the pump will be strong enough.
Question by: Lola Knudsen on Feb 7, 2016 5:11:00 AM
Great question!
The MJ1200 would be a little limited to push back up 30". we recommend an alternative such as a sicce 1.5 which can handle a greater head height. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 10, 2016 6:50:00 PM
I want to use an external pump to run these dual canisters, what size pump will I need?
Question by: Carlos Feliciano on Dec 2, 2016 6:26:00 PM
Great question! A pump with a minimum of 300GPH would be necessary to effectively tumble GFO and provide proper flow through the carbon chamber. :-)
Answer by: Randy (Admin) on Dec 13, 2016 8:56:00 PM
My dual reactor slowly fills up with air over a day. I have to adjust to zero flow, let the water level rise, then slowly turn on the flow to push the remaining air out. Any recommendations?
Question by: Rik on Jun 26, 2014 4:35:00 AM
Hi Rik,
The reactor has a small air bleed hole that can be found on the underside of the bracket/lid assembly when the canisters are removed. Most likely it just has a bit of detritus stuck in it. You should see one large exit hole in the middle, and towards the exit side of the reactor a very small hole. Cleaning that out will help the air to bleed out of the system as it runs. That said though, couple of other points worth mentioning.

First of all, if air is finding its way into the reactor you likely need to submerge your pump farther. Sounds like its sucking in air.

Second, and likely most importantly, if their is some air in the reactor it won't effect the performance in anyway. The water is traveling through the system as it should so removing the air is purely an aesthetic thing. It is just for looks, so you could just as well leave it as well :)
Answer by: Bulk Reef Supply on Jun 26, 2014 4:35:00 AM
In a single carbon or gfo reactor such as the brs brand can I use bio pellets on them or not
Question by: Jayden Marrero on Jun 6, 2017 8:19:00 PM
In a single canister reactor, these can be used for biopellets, but we don't recommend running them in the dual reactor due to tuning issues. If you run biopellets, just don't use the sponges as this can reduce the water flow over time.

Happy reefing!
Answer by: Zack (Admin) on Jun 13, 2017 4:24:00 PM
Hi Guys,

I have some questions on the BFS dual GFO and Carbon reactor. Which one is best for my size tank..

I have a 75 G reef with a sump under the tank in the cabinets... I have room for the reactor next to the sump I have limited space inside the sump with my skimmer etc.

So, can the reactor sit outside the sump and how big of a pump will be needed and the dimensions of that pump so I can be sure the pump will fil in the sump...

If you could give me that info I'll get it ordered.

Question by: James on May 8, 2016 12:11:00 PM
Great question!
The dual reactor will work perfect and easily can be mounted in the sump or externally mounted to the outside or wall of the stand. If the reactor will be within the 2-3 feet of tubing included we recommend the Cobalt Mj1200 pump which is very small only 4x 2x 4 inches. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on May 10, 2016 6:00:00 PM
I am in the process of setting up a 150g tall reef. Would these reactors be able to handle this size tank with a medium to mid heavy bioload?
Question by: Mynor on Apr 24, 2016 3:18:00 PM
These will certainly work well! You will want to consider higher quality media such as ROX 0.8 Carbon and GFO as your main source.
Answer by: Connor (Admin) on Apr 27, 2016 1:52:00 PM
I need some new tubing for my reactor. What size tubing could I buy and ifni could buy them on BRS that would be ideal.
Question by: Jordan on Jun 6, 2017 9:59:00 PM
Hey there,

We do sell extra tubing for our reactors. This is sold as 1/2" Mur-Lok RO tubing.

Have a great day!
Answer by: Zack (Admin) on Jun 13, 2017 4:43:00 PM
I just purchased the BRS GFO & Carbon Reactor but I am wondering if the flow is the same for the carbon as it is for the GFO how can I ensure that the flow will not push the GFO out into my sump?
Question by: Jeff on Mar 29, 2016 11:05:00 AM
Great question!
The flow will typically be base off of the GFO requirement. You will place the sponge at top to prevent GFO from flowing through. Ideally the GFO will tumble smooth without being forced to the top. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 30, 2016 11:44:00 AM
Hi I have a red sea 350 reefer (93 G total) I want to run gfo and rox 0.8 carbon what reactor would you recommend is the better choice.
1. BRS GFO & Carbon Reactor – Dual
2. BRS GFO & Carbon Reactor - deluxe
Question by: MIGUEL VILLALOBOS on Mar 15, 2016 11:18:00 PM
Great question!
When using the ROX 0.8 carbon you can select either and they will work great! You will use around 1/2 cup of media an the reactors can handle twice that amount. If you are planning on using GFO as well the dual will be nice as you can change the Carbon and GFO at different times. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 16, 2016 11:08:00 AM
I have just a single carbon reactor now and I want to switch to the dual reactor is it ok to run the gfo all the time like I do with my carbon? Still new to all this so I just keep researching.
Question by: Jason on Feb 8, 2016 11:08:00 AM
Great question!
GFO will be run very similarly to carbon however ideally it will be tumbling. You will change the carbon once every 4 week and GFO once every 6-8 weeks. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 10, 2016 5:36:00 PM
I am currently running a dual reactor with GFO and carbon. I am considering running bio pellets instead. Would it need to Br modified and what would you suggest I run in the second chamber?

Thanks for your help

Question by: Bill Ramey on May 9, 2016 8:01:00 AM
Great question!
Depending on your system size we do not recommend running bio pellets in the standard dual reactor. This would clog very quickly and not feed the correct number of pellets. We recommend a dedicated bio pellet reactor instead.
Answer by: Connor (Admin) on May 11, 2016 5:37:00 PM
I was interested in getting a reactor for my 90G reef tank. Which reactor would you recommend? The single or the dual?
Question by: Dylan on Jul 11, 2014 3:09:00 AM
Hi Dylan,
Assuming you want to run GFO and carbon you would want the dual reactor for a tank that size. If you just plan to run a single media, then the single would be fine.
Answer by: Bulk Reef Supply on Jul 11, 2014 3:09:00 AM
I been using it for a week and I don't see my water look clean The flow it's got to be very low so the gfo don't go into my tank oh good may fix the problem
Question by: Freddy on Jan 13, 2016 10:03:00 PM
Hey there!
Great question. When dealing with water clarity it can vary greatly depending on the elements in your tank. If the water contains green water (Algae) It will be tough for the Carbon to remove any of the colors from the water and a large water change will need to be performed. With the GFO often you can attempt to add an additional sponge in the top to help catch any GFO particles from flowing into the tank. If the issues continue feel free to give us a call and we will be more than willing to help!
Answer by: Connor (Admin) on Jan 14, 2016 11:42:00 AM
I currently own this reactor and really like it! I noticed it resembles a simplified RO/DI unit and was wondering if it's possible to convert my old RO unit into another reactor similar to this one. (I try to recycle and reuse old equipment as much as possible
Question by: Shara Armstrong on May 9, 2016 8:46:00 PM
Great question! While there certainly is some resemblance, the fittings used for our RO units are 1/4" while the reactor uses 1/2" to allow for greater flow. Unfortunately because the ports on the RO housings are only 1/4" you likely won't be able to get enough flow enable useful function as a reactor.
Answer by: Carter (Admin) on May 10, 2016 5:32:00 PM
OK Im needing the orings for this unit and couldn't local it can you send me a link by the way love the unit
Question by: Drexter Istre on Dec 16, 2016 11:34:00 PM
Answer by: Randy Russell (Admin) on Dec 21, 2016 3:20:00 PM
I have the BRS Dual Reactor do you have a plumbing adapter that will take the hose the is supplied with the reactor and attach it to 3/4" PVC plumbing so it can be added into my existing plumbing?
Question by: Ryan Spelman on Feb 9, 2017 11:49:00 AM
Hey there! Below are links to the products we use to reduce a 3/4" fitting to 1/2" and to add a push connect fitting for use with our reactors. :-)

Schedule 80 Reducing Bushing 3⁄4” Spigot x 1⁄2” Slip

1⁄2" Male NPT x 1⁄2" Push Connect
Answer by: Randy (Admin) on Feb 9, 2017 2:30:00 PM
Just cleaned the dual reactor started it up not working correctly. There is a lot of air in it. How do I fix this ?
Question by: john trapp on Nov 7, 2016 10:43:00 AM
Great question! One of the best ways to get the air out would be to lightly crack open the canisters while the system is running. That should release the air pockets. :-)
Answer by: Randy (Admin) on Nov 7, 2016 10:48:00 AM
i have a 264 gph submersible pump, would that be enough to work for this?
Question by: Devon on Jul 21, 2014 6:07:00 AM
Hi Devon,
As long as it has a reasonable amount of power it should be just fine.
Answer by: Bulk Reef Supply on Jul 21, 2014 6:07:00 AM
Could a eheim 1000 work for this?
Question by: James cross on Mar 19, 2016 7:23:00 PM
Great question!
This could work however the Eheim pump connects to 5/8" tubing which will be very very difficult to convert to the 1/2" OD Polyethylene tubing on the reactor. we do not currently have any adapters or components to make the connection. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 21, 2016 5:14:00 PM
Will the pump that comes with this reactor work for a 500 gallon tank? Or is it best to use it in the sump?
Question by: King on Jun 5, 2016 5:29:00 PM
The pump is rather small and not recommended for large head height. We recommend running from the sump instead.
Answer by: Connor (Admin) on Jun 9, 2016 3:18:00 PM
I just purchased one of these and was wondering if I could hard plumb it from my return pump instead of using the pump it comes with.
Question by: Tom on May 29, 2017 7:25:00 PM
You absolutely can! Canisters come with NPT threaded ports and the fittings can be replaced if you wish to plumb directly to the filters.

Have a great day!
Answer by: Zack (Admin) on Jun 7, 2017 1:37:00 PM
Does the Gfo and carbo duel reactor come with the tubing to hook it up? And can you run carbon and Gfo at same time ?
Question by: Jeff on Jan 29, 2016 8:25:00 AM
Great question!
In the Dual reactor the plumbing and all components will be included. With the Dual it is recommended to run the GFO in the first chamber and carbon in the second chamber.
Answer by: Connor (Admin) on Feb 9, 2016 2:24:00 PM
Can you run Phosgaurd in these?
Question by: John Sullivan on Sep 6, 2017 10:48:00 PM
Hey there,
Thanks for getting in touch with us in regards to using Phosguard in our reactors. These would be great for use with Phosguard. Please let me know if there is anything else that we can assist with. Thanks!
Answer by: Tyler Schafer (Admin) on Sep 24, 2017 2:20:00 PM
How would you go about hard plumbing this? I assume unscrew the push---->mpt fitting and insert pvc fitting i there? What size would that be?
Question by: John Hendrickson on May 8, 2017 10:05:00 PM
Hey there,
If you would like to hard-plumb your reactors, you can certainly plumb directly to the canisters using 1/2" npt fittings.

Have a great day!
Answer by: Zack (Admin) on May 12, 2017 4:05:00 PM
I'm going to need longer tubing due to it being placed underneath my tank. What size tubing do I need? What else will I need such as elbows to route the cords better?
Question by: Vincent on Apr 29, 2014 6:11:00 PM
Hi Vincent,
The tubing is 1/2" RO tubing which can be found at the link below. Fitting wise, it depends on your setup but elbows are largely it. Perhaps a 1/2" union if you need to connect two pieces together in a straight location (but its usually cheaper just to buy a longer length of tubing then to buy the fitting to connect two together).
Answer by: Bulk Reef Supply on Apr 29, 2014 6:11:00 PM
Hi im having a high phosphate and nitrate problem and its causing algea in my tank. I dont have a sump. Im new to this all. This is what is needed to helo lower them right? And i was buying the reactor dual with the pump combo. What else will i need for full setup. Want to mount it in the cabinet below aquarium. And not sure what stuff
Goes inside it. Do i need all gfo and if so what kind of gfo?
Question by: jenny Guttromson on Apr 16, 2016 12:44:00 PM
Great question!
The Dual reactor will work great to run carbon for removing color, and odor from the water and GFO for removing phosphate. This is one of our favorite set ups to keep the system running!
Not much more will be needed beside the GFO and Carbon. For nitrate control the best will be regular water changes however there are several options for nitrate control available. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 20, 2016 12:55:00 PM
I have read all the info available for this piece of equipment, and i have read all the questions trying to understand why, but what exactly makes this reactor incapable of running high quality carbon in the first chamber and bio pellets in the second? it looks like the same type of construction on your specific bio pellet reactor, and i would like to better understand the differences!
Question by: Adam on Apr 16, 2016 2:59:00 PM
Great question!
We do not recommend bio-pellet in the reactor for several reasons. In the second chamber the flow is greatly reduced (the whole unit if placed in the first chamber) The flow on a stand alone bio-pellet reactor is best adjusted independently from carbon and GFO to keep from adding too much flow or too little which either makes the pellets clog or release too much food into the tank. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 20, 2016 1:55:00 PM
I see you sell extra cartridges for hte 5 inch reactor, do you sell extra cartridges for this 10 inch reactor?
Question by: John Kaplan on May 10, 2017 8:38:00 AM
Hey there,
We sure do! You can purchase replacement hard-shell cartridges for our reactors at the link below!

Happy reefing!
Answer by: Zack (Admin) on May 14, 2017 2:21:00 PM
I believe I've gone through all the questions but I haven't seen an answer to mine. Is there a way to flush out just the GFO? Would flushing out the GFO through the carbon clog it up? Or should the GFO be flushed out separately before adding to the reactors?
Question by: Jonathan Lobo on Apr 29, 2017 10:21:00 AM
Hey there,
Whether you are using one media or both, it's totally fine to flush your media prior to running on the tank. We prefer to do so after the media is inside of the reactor by turning it on and running the initial output into a bucket. We demonstrate this briefly in a video at the link below. (media flush is around the 4 minute mark).

Hope this helps!
Answer by: Zack (Admin) on May 2, 2017 10:31:00 AM
How much carbon and gfo for a 125 with a 40g sump
Question by: Ricky Goodwin on Jan 17, 2017 6:12:00 PM
Great question! We have the perfect tool available to help you with questions just like this! If you haven't already, check out the BRS Calculator located in the link below. :-)

From my calculations, you would need about 2 cups of Standard GFO and 0.81 cups of ROX 0.8 Carbon.
Answer by: Randy (Admin) on Jan 17, 2017 6:40:00 PM
So I bought the dual reactor and I'm putting a 3 stage sump on my tank. What part of sump should I put the feed pump for the reactor and should I feed it into the refugium section or into the final stage of the sump? Thank you for your help!
Question by: Jason Mahnke on Aug 25, 2016 9:36:00 PM
Thanks for reaching out to us! I would place the feed pump in the first chamber and have it drain into the return pump chamber. :-)
Answer by: Randy (Admin) on Aug 26, 2016 3:12:00 PM
I ordered this and the connectors leak where the tubing goes into the reactor. Am I doing something wrong ?
Question by: chadb202 on Dec 21, 2015 8:47:00 AM
Hey there,
I am sorry to hear about the reactor leaking, You most likely are not doing anything wrong however the connections sometimes need to be removed and reinserted to make a proper seal with the quick connect. If the issue persists feel free to give us a call and we will be more than willing to help!
Answer by: Connor (Admin) on Jan 6, 2016 5:56:00 PM
Can you use purigen in one chamber instead of carbon along with gfo in the other chamber? How would that affect a 75g reef?
Question by: Josh on Jun 20, 2016 4:32:00 AM
There is no reason you cant use purigen in the reactor as well. Will simply run the media in a reactor style. Typically you will want GFO first to adjust the tumble correctly.
Answer by: Connor (Admin) on Jun 21, 2016 5:40:00 PM
I have a fish and reef tank 45 g/ fluval 206 canister filter/ Octo skimmer, but no sump. Running for 3 years. Can this be set up under tank and does it come with tubing set up for that? I'm planning on upgrading to a 125 or 150 g in near future so will this still be effective in a larger tank as well?
Question by: Angela on Dec 9, 2016 12:11:00 AM
Great question! You can utilize this under your tank, however you may need a more powerful pump to account for the head height of pushing water down and back up into the aquarium. For this, I would recommend a Sicce 1.5. :-)
Answer by: Randy (Admin) on Dec 9, 2016 9:33:00 AM
Can pump be installed on either side of Reactor?

Does it matter which media flow hours through first?

How does it flow through each, outside down to bottom then up middle?
Question by: Mark on Oct 28, 2017 8:57:00 AM
HI Mark, thanks for reaching out!

The reactor has labeled "IN" and "OUT" ports but you can flip the bracket if you require the feed pump to be on the opposite side.

It does not matter which media is placed in the first canister but many people find it easier to tumble their GFO by placing it in the first canister and holding their carbon between sponges in the second.

When run as recommended, the water flows into the reactor, down around the outside of the refillable canister and then up through the bottom of the canister.
Answer by: Nick (Admin) on Nov 17, 2017 8:49:00 AM
I have a 200 gallon tank and was wondering if this dual reactor will be enough capacity to hold both GFO and Carbon to make it beneficial towards filtering my tank.
Question by: Louis Tong on Feb 25, 2016 9:49:00 PM
Great question!
Unfortunately the dual reactor would be a little small however could work with ROX 0.8 carbon and High Capacity GFO. On a larger tank such as 200 we recommend more room in the reactor with the Jumbo BRS reactor or even the Phosban 550. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 26, 2016 9:53:00 AM
Hello, i need replacement sponges and screens for the Bulk Reef Supply dual reactor. Do you sell these? What item number is it?

Question by: TRavis on Dec 22, 2015 8:04:00 AM
Great question!
We do have replacement pads available (Listed in the link below). Unfortunately we do not have replacement screens available. Feel free to let us know if you have any further questions!
SKU# 204186
Answer by: Connor (Admin) on Jan 7, 2016 11:07:00 AM
I have this reactor. I find it really hard to disconnect the tubing from the push connect fittings. I need to disconnect the tubing whenever I change media so I can connect a longer outlet tube to drain into a waste bucket. Is there a trick to disconnecting the push connectors? I know you have to push in the connector but it is hard. I tried cutting a ring of pvc pipe to fit around the tubing to use to push in the connector, that helps a little, but it is still hard. Do they make a tool to do this?
Question by: Michael Ryeburn on May 2, 2016 11:48:00 AM
Great question!
I have included a simple link below for the instructions on removing the fittings but it sounds as if you already know the general way to disconnect them.
I have included a few items below which can be added to the tubing to make it easy to disconnect which not dealing with the mur lok fitting.

1/2" Female Thread Cam Lever Coupling - D
SKU: 209945

1/2" Female Thread Cam Lever Adapter - A
SKU: 209927

1⁄2" Male NPT x 1⁄2" Push Connect ( you will need 2)
SKU: 100003
Answer by: Connor (Admin) on May 3, 2016 6:37:00 PM
Hello. Does the water through the GFO container and the one flowing through the Carbon container have the same flow rate?
Question by: Peng on May 8, 2014 7:46:00 AM
Hi Peng,
Yes they are connected in series and will both have the same flow rate.
Answer by: Bulk Reef Supply on May 8, 2014 7:46:00 AM
So my question is about routing the plumbing.... Is there a right or wrong way? I have a sump and I have it it coming out of the return side of the sump and have it going right back in the same chamber.... Is this bad or could there be another way? Also I have a maxi jet 1200 powering it.. But it's wide open and doesn't seem to be tumbling hype gfo very much... Any help would be great... Thank you.
Question by: David on May 9, 2014 8:38:00 AM
Hi David,
There isn't really a right way or wrong way here. Your going to cycle the tank over so many times over the coarse of a day, week, etc that I would just plumb it in the most convenient way possible. Generally this is going back to the same chamber you pumped it from as then you don't have to worry about any odd siphoning issues or anything like that. Your looking for the least amount of flow that keeps the GFO from turning into a big brick, so long as it hasn't solidified into a block your good to go :-)
Answer by: Bulk Reef Supply on May 9, 2014 8:38:00 AM
My question is if you have to put the reactor inside sump or could you get away putting it outside the sump since I don't have enough space for the reactor inside the sump.
Question by: Juan Bohorquez on Mar 10, 2016 1:50:00 PM
Great question!
The reactor can be placed anywhere in the sump or out of the sump. It is sealed and will not leak if mounted externally. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 10, 2016 4:35:00 PM
Hi. I have a 200g mixed reef tank but I feed pretty heavily since I have some big tangs. My phosphates have been pretty high and can only put in 1.5 cups of the high capacity GFO so it tumbles properly. Can I put in this GFO in the carbon chamber as well and run double GFO with no carbon? Thanks.
Question by: Duy on Apr 18, 2016 4:43:00 PM
Great question!
While it is possible the flow rates would be different from chamber to chamber and impact the performance. ideally separate pumps or a larger reactor will be needed.
Answer by: Connor (Admin) on Apr 25, 2016 6:54:00 PM
Could you use a carbon block instead of the granular carbon in the carbon part?
Question by: Brian on Aug 25, 2014 8:36:00 AM
Hi Brian,

Due to the great deal of pressure needed to force water through the carbon block this would not be possible with an ordinary water pump. Also, the small pore size would quickly clog as detritus from your system was pumped through the block. I would stick with one of our granular carbons.

I hope this helps!
Have a great day :)
Answer by: Bulk Reef Supply on Aug 25, 2014 8:36:00 AM
Is it possible to make this reactor have separate flows to each chamber so to tire each media different. I hope that makes since. Also is it possible to use a a different media other then GFO for the removal of phosphates.
Question by: James on Jan 20, 2016 11:54:00 PM
Great question,
You can attempt to move the position of the canisters to adjust so they are not next to each other if needed. Other medias can easily be used in the reactor without issue. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 27, 2016 7:59:00 PM
Would you be able to run a combo of GFO and carbon in the first chamber and biopellets in the 2nd? Or would you need to have 2 separate reactors for this? Thanks in advance.
Question by: Daniel on Apr 5, 2016 3:20:00 PM
Great question!
You will not be able to run Bio pellets in the standard carbon or GFO reactors. They will be a