BRS Biopellet Reactor Combo Kit

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  • How to set up a BRS biopellet reactor

BRS Biopellet Reactor Combo Kit

97% Recommend this to a friend (28 of 29)

SKU: 221012

reg. $74.99

Special Price: $63.74

In Stock: 51
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Quick Overview

This combo pack comes with the following items:

  • One BRS biopellet reactor

  • 500mL of BRS biopellets

  • One refillable cartridge

Designed to be easy to use, set up and maintain. Perfect for tumbling biopellets. No thumbs screws, foam pads or leaky lids common with other reactors. The reactor will hold up to 350mL (~1.5 cups) of biopellets.


Full Details

The BRS Biopellet Reactor features several distinct advantages over other brands.

  • Heavy duty all 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.
  • Filter wrench
  • (2) 3 Ft. sections of tubing
  • Instantly attaches to popular pumps using included push connect or threaded fittings.
  • 1/2" fittings and ports throughout reduce head pressure and provide ample flow rates.
  • Holds up to 350mL of biopellets (~1.5 cups), suitable for tanks 75g or smaller
  • Dimensions: 14.5"H x 5.5"W x 5"


BRS biopellets are made from 100% natural Polyhydroxyalkanoates. PHA is a natural substance produced by bacteria to store carbon and energy which makes it the ideal solid carbon source for denitrifying bacteria in the aquarium. BRS bio pellets are produced by a leader in the industry, designed specifically for denitrification in aquaria and we believe it to be the best product available. Use of bio pellets will also remove phosphates, combined with wise food selections it can be the only type of phosphate control required.


We recommend 1 cup (236 ml) of BRS biopellets per 50 gallons of system volume.


Solid carbon dosing (biopellets) has recently become an extremely popular method of removing nitrates from the aquarium. The exact method of denitration can be different for each tank but it mainly consists of a few things:

  • Nitrate laden Bacteria is removed via the protein skimmer
  • Bacteria directly converts nitrite into nitrous oxide so nitrate is never produced
  • Bacteria consumes nitrates and processes them down into nitrogen gas
  • Nitrate laden Bacteria is consumed by tank inhabitants like corals and sponges


Depending on the system it should take 4-8 weeks for the bacteria population to multiply and begin its work on your nitrates. Once you have the reactor going we suggest not making any adjustments for 8 weeks. Give the media and bacteria time to adjust to the parameters found in your tank and begin working. The absolute best advice we can give with this system is to set it up and forget about it for two months. Unless something is obviously not right resist all temptation to make any changes until the two months are up.


Feed pump notes - You may use a variety of different feed pumps for this reactor but there are two popular options we recommend.

Sicce Syncra Silent 1.5 – This pump is more than strong enough to tumble the biopellets continually and will likely have to be dialed back using the included valve. This will allow room for you to turn up the flow inside the reactor if it were to slow down due to tank debris collecting in the cartridge strainer. This pump option requires the least amount of maintenance and effort.

Maxijet 1200 – This is an affordable option and works well within a few constraints.



  • It is important to install the reactor close to the water level of your tank/sump to minimize head pressure.
  • It is also important to keep the cartridge strainer free of floating tank debris. You can do this by using the foam maxijet prefilter, filter socks on your sump return and placing the pump in a clean area of your sump
  • If it does clog you can clean the cartridge strainer as part of your standard maintenance schedule or upgrade the pump at a later date.


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  • Inexpensive, but Inefficient By KC on 10/16/2016

    Love all things BRS but this reactor is not BRS quality in my opinion. Even for smaller systems, the biopellets quickly clog the screens even using a Sicce pump. I can't imagine how bad it would be with an undersized pump. Save your money and buy something else... the maintenance on this reactor will drive you crazy. Otherwise plan on cleaning the screens at least once per week.
  • Great AIO package By Thomas on 12/30/2014

    This is everything you need(except a pump) to start running bio pellets. Great for smaller tanks. For all the bio pellets to tumble right it says to only use 350ml which is not enough media for larger tanks.
  • awesome By tonyz on 12/28/2014

    Easy set up . But I used a tee off of my feed line to my gfo and carbon reactor which is a tee off of main return to tank so no powerheads to burn out and no extre pump to buy. I just got it for xmas so dont know about biopellets yet.
  • Order 1100225796 By Marta on 11/28/2014

    Perfect for beginner... Highly recommended.
  • biopellets By travis on 6/13/2014

    Love this combo try it with the maxjet 1200 but not enough after a while just upgrade the pump and in 5 days my nitrates were wiped out awsome
  • Good Value By reefracer on 3/5/2014

    The kit is complete setup, only complaint for me is the supplied tubingis too short for where iIwwanted to put the reactor which is on the wall behind the tank right beside my BRS carbon and gfo reactors so Ihad to get longer tubing to connect. I also purchased a mag 3 pump to power it which Charlie at BRS ssuggested, I have 100 gal water volume so all the two cups of pellets supplied in the kit were used. There is a issue with getting all the pellets to tumble as needed even with the mag 3, the problem that I had is if I give the reactor full flow approximately 1/2 of the pellets goes to the top and don't tumble and the bottom half tumbles very good. I found "most" of the pellets tumble slowly if I throttle back the mag 3. I have not tried any adjustments to it as it has been running 5 days, I may try to teak it some more after running for a couple of weeks. Some others have complained of debris clogging the reactor, I hope this won't be an issue for me since I am using the foam prefilter supplied with the mag 3. They recommend once the reactor is running not to touch it for 6months and then only to add pellets as needed which is what I plan to do with only exception is to clean the mag 3 prefilter as needed, we'll see how it goes
  • Best by far By Robert on 2/15/2014

    Got this bad day in and it was stellar..... tried others first but now I realized I wasted my money.... so glad I have this now....
  • Good economy reactor By Denise on 1/11/2014

    I got the Biopellet reactor with Mag drive 3 pump. It was fairly easy to set up though be warned if you attach it in correctly the push fittings are a pain to get unattached. The pellets tumble well but it seems a little temperamental and they occasionally get stuck up at the top. I have fairly low nitrates to begin with as its a young tank with only two very small fish but I like corals that eat and plan on having more fish so I wanted to get the biofilter started.
    Pros: very good quality for price
    straight forward set up
    good customer support
    seems to mostly work as described

    cons: make sure you double check where to attach everything as push fittings are a pain
    can be temperamental if debris ends up on the top of the media canister filter. The Mag drive 3 is supposed to limit this problem but mine has gotten clogged already.

    Overall i would recommend it to a friend who was looking for a no frills reactor for a great price. I am pleased to have an inexpensive option which leaves more money for corals
  • Working great, keep up on pump maintenance. By MandM on 11/24/2013

    Love the reactor, I've stopped the vodka dosing and that freed up a dosing pump for my Mg.
    I'm using a Maxijet 12 (the Cobalt version) and it's tumbling the media just fine. I recommend cleaning the pump monthly. I slipped on that maintenance and noticed today the pump was not working. Not sure how long it sat but when I removed the reactor and pump to clean, SWEET JEEBUZ the smell was evil. Flushing with RODI and cleaning the pump with vinegar did the trick. Tonight's adventure has resulted in a new phrase around my house, "Alright, who's Carbon dosing?" LOL
  • Not for biopellets By trigger on 5/17/2013

    I have 1 of these reactors and 2 of the black brs ones. They are perfect for GFO and Carbon, however i dont think they are ideal for Biopellets what so ever. After just 1 week the biopellets are barely tumbling because of gunk buildup inside the filter that restricts flow. This has to be cleaned weekly to keep the biopellets tumbling. Having to do this makes it a chore so I am seriously considering a different reactor. I hope BRS will re-design this reactor so that it doesnt clog as easily. Do not recomment for BIO Pellets. Only for GFO and Carbon.
  • The proof is in the pudding By Collin on 2/28/2013

    I did about a month of solid research before committing to bio pellets as a form of biological filtration. After scouring the web, I decided to give the bio pellet kit a try.

    The reactor was super simple to set up (total set up time was around 15 minutes). The reactor is made from heavy duty plastic. Another quality product from BRS!

    After 8 weeks, my Elos nitrate test kit tested between 2.5 - 1.0ppm nitrate (the colors were too hard to distinguish). My nitrates were stuck at 10-15 ppm for the past year no matter what I tried (water changes, chaetomorpha). Simply unbelievable. My nitrates are dropping by the day.

    Make sure you read, and re-read the instructions on the BRS website---it'll save you a ton of time and headaches down the line.

    Like the instructions say --- be patient! I tested nitrates almost every other day (I'm impatient like most reefers), but the patience finally paid off after 8 weeks.

    You'll need to have a decent skimmer if you run bio pellets, otherwise you won't see the results (or so I've read). My Tunze 9002 skimmer started to produce dark tea-colored skimmate after running bio pellets.

    One tip though---do NOT purchase the Maxijet1200 pump if you plan on running a smaller pump with this reactor. The newer Maxijet pumps rattle cos it can't handle the head pressure. Instead, order the Cobolt Aquatics pump (made in Italy). I'd recommend going the Mag3 if you can (like BRS recommends).

    Like some, I experienced cloudy water, but as long as you have a decent skimmer, and lots of water movement, you should be fine. My livestock and corals survived, and are now showing full polyp extension. If you have an ORP meter, keep on eye on it so that your oxygen levels don't drop too much. Install extra powerheads if you need to oxygenate your water. The cloudiness subsides after 3-4 days. However, your results may vary.

    Above all, be patient, follow the instructions, and you shall be rewarded. I'll definitely run my next tank using biopellets.
  • Another winner from BRS By shaungee on 12/28/2012

    I got the combo kit from BRS just recently, so I can't comment on the effectiveness of biopellets in my system yet, but this reactor is the same quality build as the dual GFO/carbon reactor from BRS I run on my tank and love it. The included canister is key in maximizing up flow in the system. I had this thing hooked up in minutes, and got a perfect tumble thanks to the included control valve. In my experiences with BRS products, if you want to get great product at a great price, it doesn't get any better than this! Highly recommended.


Ask a question

Product Questions

I have seen where BRS recommends the Mag drive 3 pump. People have bought it and like it, and yet, I can't find anything on your site called Mag drive 3 pump or Mag 3 pump. What's the link? thanks
Question by: Steve on Jan 26, 2016 2:47:00 PM
Great question!
Unfortunately the Mag Drive pump is no longer carried by us however we do recommend the Sicce 1.5 as an alternative. I have included a link below!
Answer by: Connor (Admin) on Feb 3, 2016 2:45:00 PM
Can this be hung on the back of the aquarium?
Question by: Scott Mikutel on Apr 12, 2016 9:41:00 AM
Great question!
This does not come with a great option to hang it unfortunately. You may be able to purchase a few extra Mur Lok elbows to hang the tubing over the side.
1⁄2" x 1⁄2" Elbow Union Push Connect
SKU: 100013
Answer by: Connor (Admin) on Apr 13, 2016 3:33:00 PM
Can you mount this to hang on back?
Question by: Scott Mikutel on Apr 12, 2016 11:36:00 AM
Great question!
these do not come with a mount to hang on the bracket however you can purchase some extra mur lok elbows and bend the tubing over the side. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 14, 2016 6:46:00 PM
I have a 90 gallons mixed reef w/ NO3 at 25.

Have been running a BRS mixed GFO & CARBON REACTOR for about 3 weeks and also running a Reef Octopus 152 classic skimmer.

Should I also install a Biopellet Reactor, if yes what are the benefits and risks?
Question by: Andre G. on May 29, 2017 11:43:00 AM
Biopellets certainly can be a useful strategy for controlling elevated nitrates. Carbon and gfo will have little impact on nitrate, so typically refugiums, water changes, or various methods of carbon dosing are employed for this. If implemented carefully and slowly, there are typically few risks associated, but some people have experienced cyano outbreaks and negative stress reactions from some corals when implemented incorrectly.

Have a great day!
Answer by: Zack (Admin) on Jun 6, 2017 4:47:00 PM
I saw the question and answer below, and I'm just asking for clarification. Does this mean that you can't run 2 separate Reactors ... 1 with GFO and Carbon and the other with Biopellets?
Question by: Adam West on Aug 11, 2016 2:29:00 PM
Hey there, you can absolutely run them in separate reactors. The OP was asking about mixing both carbon and pellets in a single reactor, which is not a possibility. :-)
Answer by: Randy (Admin) on Aug 16, 2016 11:47:00 AM
Can this be used on a freshwater aquarium?
Question by: Ben Petrini on Feb 23, 2016 11:32:00 PM
Great question,
Unfortunately Bio-Pellets are used on Saltwater tanks only with well sized protein skimmers. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 24, 2016 3:15:00 PM
I have the jumbo BRS reactor with a mag 3 I use for carbon; can I mix these Bio Pellets with the carbon? Would it be effective?
Question by: Gary Willis on Jun 5, 2016 11:54:00 PM
Unfortunately Bio-pellets cannot be run with order media in the chamber. For Bio-pellets we recommend running an independently designed bio-pellet reactor for proper flow and tumble of the pellets.
Answer by: Connor (Admin) on Jun 9, 2016 4:52:00 PM
I have a 210 Mixed Reef. I have a Nitrate level that hovers around 20ppm, so, not too high but not low either.
How long will the bio pellets last while keeping my nitrates down?
Question by: Gary Willis on Jun 5, 2016 11:56:00 PM
Great question!
Several months for the pellet life. We recommend a larger reactor for such a large system however.
Answer by: Connor (Admin) on Jun 9, 2016 4:54:00 PM
Can I use this as a purigen reactor if yes do I need to modify itit? If not can you recommend a reactor for use with purigen please. Also if I can use purigen with the unit how much ml of purigen will it take thanks
Question by: Duane Fagan on Feb 24, 2016 3:06:00 PM
Great question!
This reactor is designed for tumbling larger pellets such as Bio pellets. If the media is smaller we recommend our standard single reactor instead. I have included a link below to our media reactors.
Answer by: Connor (Admin) on Feb 24, 2016 3:07:00 PM
Is it possible to find or create a duel GFO and Bio-pellet reactor using one pump? Similar to the Duel Carbon/GFO reactor.
Question by: George on May 5, 2016 3:37:00 PM
As both media need high flow to tumble and the bio pellets will release a small amount of waste which would clog the GFO. This would not work as a dual Bio pellet/ GFO.
Answer by: Connor (Admin) on May 5, 2016 3:56:00 PM
I use the gfo and carbon reactor plus the biopellet reactor running seperately with your bio pellets its been running since dec 24 2014 with the same pellets . I have it on my 150 fowlr I know its to small for tank but didnt see that when I ordered it. Now my tank has a rotten egg smell is this from the pellets ? Do I need to change them?
Question by: anthony on May 7, 2015 4:10:00 PM
No answers yet. Be the first to answer the question!
Can the BRS Biopellet Reactor be installed in series with a BRS GFO and BRS Carbon reactor...or does it need to be a "stand alone"?
Question by: Tommy on Apr 15, 2014 11:31:00 AM
Hi Tommy,
The biopellets do not play well with others so they need to be stand alone.
Answer by: Bulk Reef Supply on Apr 15, 2014 11:31:00 AM
Hello, I was wondering if it is possible to use the aquatop Aquarium Power Head PH-22 to feed the reactor?
Question by: Jesse on May 4, 2014 7:05:00 PM
Hi Jesse,
I am not familiar with that particular powerhead but so long as it has sufficient flow and power, similar to the recommended mag drive 3, then you should be ok. You just might have to adapt your own plumbing as the included fittings might not connect right to it like they would with the recommended pumps.
Answer by: Bulk Reef Supply on May 4, 2014 7:05:00 PM