BRS Bulk Biopellets

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  • BRS PHA Biopellets

Quick Overview

BRS Bulk Biopellets work to remove nitrates produced when fish foods and resulting waste break down. Maintaining low nitrates is key to maintaining the best coral coloration, healthy fish and avoiding algae outbreaks.

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

Available in four sizes:

  • 1/8 Gal (500mL)

  • 1/4 Gal (950mL)

  • 1/2 Gal (1900mL)

  • 1 Gal (3800mL)

  • Quick Overview

BRS Bulk Biopellets work to remove nitrates produced when fish foods and resulting waste break down. Maintaining low nitrates is key to maintaining the best coral coloration, healthy fish and avoiding algae outbreaks.

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

Available in four sizes:

  • 1/8 Gal (500mL)
  • 1/4 Gal (950mL)
  • 1/2 Gal (1900mL)
  • 1 Gal (3800mL)

BRS Bulk Biopellets

88% Recommend this to a friend (72 of 82)

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Choose a size

500 mL
SKU: 000626

reg. $29.99

Special Price: $25.49

1/4 Gallon
SKU: 000627

reg. $49.99

Special Price: $42.49

1/2 Gallon
SKU: 000628

reg. $89.99

Special Price: $76.49

1 Gallon
SKU: 000629

reg. $159.99

Special Price: $135.99


Full Details

BRS Bulk Biopellets are made from 100% natural Polyhydroxyalkanoates or PHA and are an excellent solid carbon source for denitrifying bacteria in the aquarium.


BRS Bulk Biopellets 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 biopellets will also remove phosphates - combined with wise food selections it can be the only type of phosphate control required.


All you need to implement BRS Biopellets is an inexpensive fluidized reactor and a pump.


Maintaining low nitrates is key to maintaining the best coral coloration, healthy fish and avoiding algae outbreaks. Fish foods and resulting waste eventually break down into nitrates. Aquarists’ primary method of dealing with nitrate removal is water changes, but over the years we have developed a few ways to remove nitrates with equipment like refugiums, sulfur reactors, and deep sandbeds. All of these methods work to various degrees but are often less efficient than we would like or the level of complexity, expense and maintenance is beyond what the average reefer would desire


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.


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  • Works fantastic By Chris on 8/21/2017

    Works great. Start off with less than 1/2 The recommended dosage. Add the rest slowly throughout the coming months
  • Great Pellet By Golden Pond on 1/14/2017

    These are just as or better than other Brands. I've found use a 1/4 as much as prescribed. They work better and faster this way. Dissolves very slow. I've had mine in 8 months and not much has dissolved but kicks nitrates and Phosphates butt 24/7. I don't even run GFO anymore after a month with this on my system. No need.
  • Best pellets By brianOH on 4/8/2016

    Pellets where smaller than i'm used to but aside from that they tumble great as long as you soak them for 48 hours. stripped my water clean in no time.
  • So far So Good By RudyEnt on 3/30/2016

    I started to use bio-pellets about a month ago. So far so good. I decided to start with much less than suggested and test my water parameters. It is a good thing I did that. I am using about half of what is recommended for my size tank and my numbers are doing great. So I am not going any higher. My skimmer has been putting out a very dark gump. I assume that it is working as everywhere I read from, that is what it is supposed to look like. I am using the pellets with the BRS reactor so I was able to adjust the flow to where they tumble nicely.
  • AWESOME! By carmelgu on 12/30/2015

    Have the Reef Octopus BioChurn 120INT on a 120 gal reef tank using BRS biopellets and the ZeoBac, ZeoSnow, Zeo 7 system....within one week my water is SOOO clear and coral is SOOO happy! Awesome product!
  • Great product By Sgt Harold on 12/26/2015

    Been using these since the I started my bio pellets reactor ! They don't grind down fast! A nice and very much will be reordering !
  • Very Nice! By Robert on 10/2/2015

    This product is so easy to use and works great, just make sure you give it time to work.
  • Would only use on Fish Only tanks By Jonathan on 8/28/2015

    These pellets work fairly well in reactors but only with lots of maintenance. A larger than normal % of them will float and clog your reactor.
  • Bulk Biopellets By chcuk on 8/15/2015

    The BioPellets worked great. My son and I have used these several times.
  • BE CAREFUL!! By James on 4/17/2015

    Dosed the recommended amount: 1 cup per 50 gallons. I dosed 2 cups for my 100gal tank. Day 5 I came home from work in the morning and saw my tank was extremely cloudy (normally crystal clear water column). I noticed a bad odor coming from the sump area. I discovered my Green Bird Wrasse had jumped from the tank, and a few hours later my Rusty Angel was dead on it's side.

    Bio Pellets will cause I major drop in available O2 levels in your tank. BE VERY CAREFUL with these pellets. DO NOT start off with the recommended dosage. I would start with 1/4th of the dose. Also, make sure you have a VERY GOOD skimmer to remove the increased skimmate from these pellets. I have stopped running my reactor and hope that when I get home in the morning I don't have anymore dead fish.
  • Not sure By Brandon on 4/9/2015

    I've used TLF pellets with good results. These BRS pellets are larger and seem to be less dense. I'm having a floating issue with a small % of them. The rest of them won't settle down to my satisfaction. The tend to hover in the middle of my reactor. Time will tell!
  • good product By subie on 2/22/2015

    Works good for nitrate so far..


Ask a question

Product Questions

How often do you recommend leaving the pellets in before having to change them?
Question by: Brendan on Apr 21, 2014 1:42:00 PM
Hi Brendan,
The pellets don't actually need to be changed out, they get consumed by the bacteria as they run so they just need to be topped off as they get consumed. It will vary but 4-6 months would be pretty typical.
Answer by: Bulk Reef Supply on Apr 21, 2014 1:42:00 PM
How often do pellets need to be changed or replaced
Question by: Robert on Dec 21, 2013 2:22:00 PM
Hi Robert,
The pellets don't get changed out you just top them off as they get consumed. Typically this is every few months (3-6).
Answer by: Bulk Reef Supply on Dec 21, 2013 2:22:00 PM
What is a base line amount of bio pellets per gal of system volume to use as a starting point? I understand that it will all depend on the bio load of each individual tank.... But there has to be a starting figure and then work from there to find what works for my tank.
My tank is currently lightly stocked, with 330 gal of total system volume

Question by: Gil on Aug 2, 2014 7:30:00 AM
Hi Gil,
250mL per 50g would be a pretty typical load. In your tank that would be about 1750mL, which is about 7 cups.
Answer by: Bulk Reef Supply on Aug 2, 2014 7:30:00 AM
I have read to "start off" with much less than the recommended dosage of "1 cup for 50 gallon", with some people saying to use half of that. I have a small bioload in my reef tank. Not many fish. Do ya'll agree to start with less in my reactor?
Question by: Lisa on Apr 11, 2016 9:24:00 PM
Great question!
I have included a link to the instructions for Bio-pellets below. We do recommend the half dosage to start with to not shock the system. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 14, 2016 4:32:00 PM
can I use it & phosguard in reactor together?
Question by: Xuan Vu on Nov 25, 2016 9:50:00 AM
Great question! These cannot be utilized together. They need to be used in separate reactors. :-)
Answer by: Randy (Admin) on Nov 25, 2016 10:22:00 AM
i want to know is i can put the Biopellets inside my canister filter
Question by: absalon quiceno on Jul 20, 2016 7:28:00 PM
Hi there,
Biopellets need to tumble to be effective, and in a canister filter the bacterial film that they can produce may quickly clog the canister making it become constant maintenance. Biopellets are best used in a standalone reactor due to the flow requirements and the specialized screens that are normally used. We really like the Reef Octopus BR series as well as their Space Saver series.
Answer by: Charlie (Admin) on Jul 21, 2016 7:32:00 AM
If I feed my tank a lot to keep certain fish happy and keep their aggressiveness at a minimum. With doing this my phosphates, nitrates and nitrites are high. would you recommend running a dual reactor system (BRS system) and running carbon in one chamber and GFO or Bio Pellets in the other chamber.
Question by: Adam on Mar 28, 2016 9:32:00 AM
Great question!
We certainly recommend Carbon and GFO to help with phosphate removal and clarity. For bio-pellets we do not recommend them in the standard BRS reactor as they will clog. Ideally a dedicated bio-pellet reactor will need to be used. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 29, 2016 12:35:00 PM
Hey i am steven luo, I am wondering can I buy this bio pellet and put in my ehiem canister filter?
Question by: steven soccer luo on Nov 22, 2016 3:33:00 PM
Hey there! In order for biopellets to be utilized effectively they do require the need for a biopellet reactor. This allows for tumbling of the media. Without the tumble, they will "melt" together in a clump and potentially overdose your aquarium, which could lead to issues like cyanobacteria outbreaks. :-)
Answer by: Randy (Admin) on Nov 22, 2016 3:35:00 PM
I've looked high and low for this answer but couldn't find it anywhere... I see it says don't touch for 8 weeks but when do you replace these? Also will I only replace part or all?

Jerry S.
Question by: JERRY on Nov 18, 2013 7:43:00 AM
Hey Jerry,
They are basically food and surface area for bacteria so you actually don't ever remove and replace them. You just add more as they get consumed. Once up and running thats usually once every couple of months.
Answer by: Bulk Reef Supply on Nov 18, 2013 7:43:00 AM