BRS GFO & Carbon Reactor – Dual

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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.
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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.More

BRS GFO & Carbon Reactor – Dual

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BRS GFO & Carbon Reactor – Dual
SKU: 204181
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BRS GFO & Carbon Reactor – Dual with MJ1200 Pump
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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.
http://www.bulkreefsupply.com/catalog/product/view/id/2030/
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
http://www.youtube.com/watch?v=M6uXz_G1xiA
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:
http://www.bulkreefsupply.com/brs-reactor-replacement-pads-hard-shell.html
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:
http://www.bulkreefsupply.com/mur-lok-ro-inline-ball-valve-push-connect.html
Answer by: Bulk Reef Supply on Oct 2, 2013 4:42:00 PM
Hello,
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
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
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
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 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 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
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
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).
http://www.bulkreefsupply.com/catalog/product/view/id/969/
Answer by: Bulk Reef Supply on Apr 29, 2014 6:11:00 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
Hello, i need replacement sponges and screens for the Bulk Reef Supply dual reactor. Do you sell these? What item number is it?

Thanks
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
http://www.bulkreefsupply.com/brs-reactor-replacement-pads-hard-shell.html
Answer by: Connor (Admin) on Jan 7, 2016 11:07:00 AM
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
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
What size tanks are these rated for?
Question by: Lance Barnes on Jan 21, 2016 2:48:00 PM
Great question!
These will work on a wide variety of sizes depending on the amount and type of media used. Up to 200+ gallons when the High Capacity GFO and ROX 0.8 carbon are used. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 27, 2016 7:36:00 PM
I have a couple of questions. First, the height listed. Is that the height of the canisters only or does that number include the bracket? Also, do the instructions tell you how much media is needed for your size tank? I have a 40 breeder. Thanks.
Question by: David on Mar 27, 2014 7:19:00 PM
Hi David,
The height is total. The amount of media you use isn't dependent on the reactor (though it has a max capaicty). The amount of media you use is dictated by the size of your aquarium and what actual media you are using. Instructions would be on the container of your media, but you can use the BRS calculator on the website to calculate out the amount for any of our BRS brand medias ahead of time. You can find it at the top of the page or at the link below:
http://www.bulkreefsupply.com/reef-calculator
Answer by: Bulk Reef Supply on Mar 27, 2014 7:19:00 PM
Bought the Dual reactor a couple months ago. The GFO is a little too much for the tank right now, (I want some chaeto to help with the Pods in the tank) so I will be pulling the GFO out, but still want to run carbon. Can I add double carbon in the GFO side just to extend the time between carbon changes, or is that a bad idea?
Question by: John on Jun 8, 2014 9:28:00 AM
Hi John,
Its not problem to run the GFO chamber empty but it wouldn't be useful to add twice as much carbon. It would still need to be changed in the same amount of time so it would really just be a waste :-)
Answer by: Bulk Reef Supply on Jun 8, 2014 9:28:00 AM
Hey I'm looking into buying this for my 120gallon mixed reef but u need to know the dimensions of it, my sump is pretty large, but I don't have a lot of space to mount inside the cabinet so I'm hoping to just place it in the sump. Thanks
Question by: Ben on Jan 23, 2016 8:29:00 PM
Great question!
With tubing installed and bracket the system will take 11" wide, 15" tall and 5" front to back. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 3, 2016 11:08:00 AM
I need to buy replacement o-rings for the canisters. Do you sell them?
Thanks in advance for any info.
Question by: Sandra on Apr 21, 2015 2:36:00 PM
Great Question Sandra! We certainly do, they can be found here: http://www.bulkreefsupply.com/o-ring-for-10-reverse-osmosis-canisters.html
Answer by: Bulk Reef Supply on Apr 21, 2015 2:36:00 PM
I saw on one of the forums that, the cobalt MJ-1200 that you suggest for these reactors is very loud. If that is the case, can you suggest what size pump(GPH) would be a suitable replacement? My system is super quiet and I would like to keep it that way. Thanks.
Question by: David on Apr 5, 2014 10:57:00 PM
Hey David,
Those folks are confusing the pump with the Marineland Maxi Jet 1200. The marineland pump used to be the go to standard however they took the design to China and ever since those pumps make a very loud rattling noise when used in a reactor or other situation with back pressure. The cobalt aquatics MJ1200 is the old original italian made pump and is the same tried and true quiet and reliable pump we were all used to and the one recommended for the reactors.
Answer by: Bulk Reef Supply on Apr 5, 2014 10:57:00 PM
I am looking to buy the Dual GFO/Carbon reactor. How often should I replace the GFO in the reactor? and does it release phosphates back into the water once it has reached it usefulness?
Question by: Travis on Jan 31, 2014 5:47:00 AM
Hi Travis,
It should be changed once its capacity has been reached. The best way to know this is to monitor your phosphates with an easy to read phosphate meter like a Hanna phosphate checker. Usually this is about 4-6 weeks but entirely depends on how much phosphates you have, which is almost entirely related to how much you feed. GFO will not release phosphates back into the aquarium however once its reached its capacity it will no longer be removing new phosphate so the levels will begin to rise.
Answer by: Bulk Reef Supply on Jan 31, 2014 5:47:00 AM
Do you sell the sponge disks that hold the media in place separately?
Question by: Michael on Feb 3, 2014 7:33:00 AM
Hey Michael,
I think these are what your looking for:
http://www.bulkreefsupply.com/catalog/product/view/id/1665/
Answer by: Bulk Reef Supply on Feb 3, 2014 7:33:00 AM
could i run the duel gfo and carbon reactor with biopellets in one chamber and carbon/gfo mixture in the second, or would the pressure the biopellets need to tumble be too much.
Question by: Joe on Feb 24, 2014 11:55:00 AM
Hi Joe,
The dual reactor is not compatible with biopellets. As much as we would wish otherwise, biopellets do not play nice with other medias and need to be run in an entirely separate reactor :-)
Answer by: Bulk Reef Supply on Feb 24, 2014 11:55:00 AM
What size carbon can use on dual reactor. U have multible. What gfo
Question by: mike on Apr 28, 2014 8:43:00 AM
Hey Mike,
Most folks use the lignite carbon in the reactor as its easy to work with in that setup. As far as GFO goes, most people use the standard GFO. The only reason to use the high capacity GFO would be if you need more then fits in the 2 cup capacity of the reactor, because the HC is twice as dense it goes twice as far for the same volume.
Answer by: Bulk Reef Supply on Apr 28, 2014 8:43:00 AM
Is there any way that I can hang this on the back of my JBJ NANO 28 gallon?
Question by: Bryant on Mar 20, 2014 6:16:00 PM
Hi Bryant,
Unfortunately the dual reactor doesn't have a hang on back configuration. It could either be mounted to the wall,stand, etc behind the tank or even just set on a desk. If you need something that has the ability to hang on the rim of a tank then I would look at the Two Little Fishies Phosban Reactor. It has a hang on back mount. The 150 will have plenty of capacity for a tank your size.
http://www.bulkreefsupply.com/catalog/product/view/id/482/
Answer by: Bulk Reef Supply on Mar 20, 2014 6:16:00 PM
I have a 150 g tank with a 25g sump below the tank, is this a large enough unit and how often would I need to change media, no phosphate problem now but looking to add fish and corals, I have 6 fish now 3" long. Thanks
Question by: jammerdave on Mar 30, 2014 6:00:00 PM
Hey there,
The reactor has a fixed capacity (two cups of media that needs to tumble, like gfo, and 3 cups for media that doesn't, like carbon) so how big it is really depends on the media you plan to run and how much you need. What medias were you planning to put in the reactor?
Answer by: Bulk Reef Supply on Mar 30, 2014 6:00:00 PM
Hi, I have a 120 gal tank, with a 30 gal sump. would it be wise to run this unit with both mixtures of gfo/carbon in both canisters vs. gfo in one and carbon in the other?
Question by: Amber on Jan 28, 2014 6:11:00 PM
Hey Amber,
With the dual reactor its best to run GFO in one and carbon in the other. GFO generally is changed less frequently then carbon when its feasible (usually monthly) whereas carbon is changed every 2 weeks. Keeping them separate allows you to do this :-)
Answer by: Bulk Reef Supply on Jan 28, 2014 6:11:00 PM
Interested in the dual phosphate/carbon reactor. Have 100 gal tank with sump, which pump do you recommend? Thanks
Question by: Greg on Mar 30, 2014 4:21:00 PM
Hi Greg,
We recommend the cobalt mj1200 for use with the dual reactor. It plugs right in, works well, and tend to last a long time.
Answer by: Bulk Reef Supply on Mar 30, 2014 4:21:00 PM
Can I run bio pellets in the first chamber and a mix of carbon/GFO in the second?
Question by: Travis on Dec 21, 2013 1:34:00 PM
Hi Travis,
The dual reactor is not compatible with biopellets. For biopellets you would want a separate biopellet reactor. The BRS biopellet reactor works great for tanks under 50g, otherwise something like the octopus BR series reactors are usually the next size up for folks.
Answer by: Bulk Reef Supply on Dec 21, 2013 1:34:00 PM
We have several BRS media reactors that we use interchangably with bio pellets, activated carbon, and gfo. I was looking on the site today to purchase two more, and see that the gfo and carbon reactor is not for use with bio pellet media. My question is what is the difference between the gfo/carbon reactor and the bio pellet reactor?
Question by: Victoria Crow on Nov 19, 2013 6:20:00 AM
Hi Victoria,
The GFO reactor cartridges have sponges (which can be removed) vs the biopellet reactor doesn't have sponges but does include an additional larger fitting for using with bigger pumps as typically biopellets require higher power pumps.
Answer by: Bulk Reef Supply on Nov 19, 2013 6:20:00 AM
I have 185 gal reef tank (SPS, LPS and soft). Would this dual reactor work? I do 20% water changes every 2 weeks. Only parameter that is off is phosphate at .22.

I have 15 medium size fish.
Question by: marco on Sep 10, 2013 1:59:00 PM
Hey Marco,
The capacity of the reactor chambers is 2 cups for GFO. For a tank that size it would work if you were using the high capacity GFO as you would only need 1.5 cups. If you were using the regular GFO you would need 3 cups and then it would not work (then you would want to look at something like the Jumbo reactor or a different manufacturer reactor like the Vertex).
Answer by: Bulk Reef Supply on Sep 10, 2013 1:59:00 PM

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.
  • 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.
  • 1/2 " fittings and ports throughout reduce head pressure and provide ample flow rates.
  • (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"
  • Pump (optional) and media sold separately

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  • Good product By John G on 1/26/2016

    This is a cost effective practical method of filtering with charcoal and GFO. Recommended as can only help an aquarium and does not hurt.
  • Easy and effective By Doug on 1/23/2016

    I've had this reactor running for over a year and it works great! Easy to set up and maintain.
  • Good product minor glitches By Horacio Cruz on 1/18/2016

    I bought this reactor for my 225 gallon mixed reef. It works great, but if you leave the valve open fully the carbon side the reactor leaks uncontrollably. So I just dailed it back, since I don't want my GFO to tumble aggressively anyway and it works fine. That's my only complaint about this product.
  • Best choice i ever made By Lil Will on 1/6/2016

    From the looks of it iam going to be using this reactor for years to come
  • Wish I Had It Sooner By Chris on 1/3/2016

    I love this thing! Easy maintenance, well constructed effective. I may have to buy these reactors for my freshwater tanks. Add on the silicone hose kit and it's even better.
  • Easy Set Up By Dennis on 12/20/2015

    Very easy to set up. Ease of use. Great deal.
  • gfo and carbon reactor By alex on 12/17/2015

    Fantastic product, very durable and has a lot of good quality in there products will buy again thank u
  • great! By DeVon on 12/13/2015

    easy install, variable media choices, i've had some nitrate and mild phosphate issues in my 240g fowlr.. I used BRS GFO in one chamber and opted to use Seachem denitrator in the second and tested before turning the pump on nitrate was 140ppm less than 48 hours after turning it on my nitrate level was 5ppm. I couldnt be happier with this product!
  • Use By Rob on 12/11/2015

    Quick and easy to fill and use!
    Cobalt is dead silent.
  • 5 star By JOE on 12/4/2015

    Easy to install and works like a champ
  • best product By cruz on 12/2/2015

    Its easy to install and does wanders no problems at all i recommend this product to everybody
  • Awsome By Reef addict on 11/30/2015

    This is a great product, easy setup work perfectly and good instructions. For the price you can't beat it. Thank you brs

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