Bulk Reef Supply

BRS Bulk Biopellets

Grouped product items
BRS Bulk Biopellets (12 oz)

SKU: 000626

In stock


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BRS Bulk Biopellets (24 oz)

SKU: 000627

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BRS Bulk Biopellets (44 oz)

SKU: 000628

In stock


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BRS Bulk Biopellets (89 oz)

SKU: 000629

In stock


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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 (8 fl. oz or 236 mL) of BRS biopellets per 50 gallons of system volume.


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 sand beds. 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 denitrification 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.


Biopellet Instructions


What's Included?

Container of BRS Biopellets (in selected size)


Please Note: Due to a printing error, the label on the biopellets container you receive may state the incorrect size. BRS Biopellets are available in 12, 24, 44, and 89 oz.

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Product Questions

hello can i use this product and uv light?
Question by: RAFAEL VANTOLRA on Mar 23, 2023, 6:23 PM
Hi there,
You can run UV and biopellets however, we recommend turning the UV off while you establish the bacteria population. Once established, you can go ahead and turn the UV back on. Running them at the same time puts you at risk for killing the bacteria.

Happy Reefing!
Answer by: Grace Knowles (BRS Staff) on Apr 7, 2023, 10:22 AM
I have a dual reactor with GFO in the first chamber and carbon in the 2nd chamber. Can I just replace the GFO with BRS bio pellets and call it a day on my reused old GFO chamber? Its a 90 gallon reef. How much to start and when to go up to full amount of bio pellets? Thanks
Question by: Randy on Nov 29, 2021, 10:33 PM
Hello, thank you for reaching out. I would not recommend running GFO or Carbon in line with bio pellets as the biopellets need to tumble to be efficient. The higher flow rates will cause the carbon to grind and turn to dust. I would recommend a separate reactor and run the pellets at a higher flow rate than you would run GFO or carbon.
Answer by: William Glenn (BRS Staff) on Dec 13, 2021, 3:57 PM
Can these be used in a system that doesn't have a protein skimmer?
Question by: Deborah Stecz on Nov 20, 2021, 2:36 PM
Hello, No, the Biopellets work in conjunction with a Skimmer. The skimmer is required to export out the bacteria removing nitrates from your aquarium. It is not effective to use biopellets without a protein skimmer. Happy Reef Keeping.
Answer by: Christian (BRS Staff) on Nov 23, 2021, 11:58 AM
Can these pellets be used in the two little fishes phosban reactor?
Question by: steve lesniak on Sep 4, 2020, 6:02 PM
Hey there,
Thank you for reaching out to us! Yes, you can use these pellets in their reactor.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero on Sep 9, 2020, 9:00 AM
Do you need to soak the pellets overnight in RO water? It was recommended by VERTEX when i used the PRO-Bio PELLETS
Question by: Jeramy Seabolt on May 12, 2020, 12:19 PM
Hi there!

They do not need to be soaked in water before, just add them to the reactor with bacteria and adjust the flow.

Have a nice day!
Answer by: Thomas Billington on May 13, 2020, 10:03 AM
Could you add to the sump via media bag and see results? Do you have to use a reactor?
Question by: Chris on Nov 2, 2017, 10:44 PM
Hi Chris, thanks for reaching out!
Biopellets need to be continuously agitated to keep them from clumping so a reactor is required. Our BRS Biopellet Reactor is a great low cost option for tanks up to 75 gallons or so.
Hope this helps!
Answer by: Nick on Nov 25, 2017, 10:39 AM
can I use it & phosguard in reactor together?
Question by: Xuan Vu on Nov 25, 2016, 9:50 AM
Great question! These cannot be utilized together. They need to be used in separate reactors. :-)
Answer by: Randy on Nov 25, 2016, 10:22 AM
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 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 on Nov 22, 2016, 3:35 PM
i want to know is i can put the Biopellets inside my canister filter
Question by: absalon quiceno on Jul 20, 2016, 7:28 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 on Jul 21, 2016, 7:32 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 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 on Apr 14, 2016, 4:32 PM
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 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 on Mar 29, 2016, 12:35 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 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 AM
How often do you recommend leaving the pellets in before having to change them?
Question by: Brendan on Apr 21, 2014, 1:42 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 PM
How often do pellets need to be changed or replaced
Question by: Robert on Dec 21, 2013, 2:22 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 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 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 AM