Bulk Reef Supply

BRS Reverse Osmosis Chloramines Monster

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The Chloramines Monster is designed to be installed on your RO system and treat the chloramines in environments where large volumes of water need to be produced. The added size and capacity of the 20 inch canister and carbon block allow for greater flow rates without reducing chlorine removal efficiency.

At common RO system, incoming flow rates (less than 1g/min) the manufacturer has informed us the Pentek CRFC20-BB cartridge will last 75,000 gallons. At a 3:1 waste to product water ratio this filter will produce almost 19,000 gallons of RO water.

Chloramine is different than Chlorine and is used in 10% of U.S. water supplies. Standard RO filters will not remove chloramines from the water. If your household water supply contains chloramines install the Chloramine Monster before your current RO system. If you are unsure if your city uses chloramines, call your water treatment center or city hall and ask. They should also be able to provide you with a water quality report as well.

Each BRS Reverse Osmosis Chloramines Monster contains a Pentek CRFC20-BB Radial Flow Carbon Filter and is ideal for chloramine taste & odor reduction in POE (Point-of-Entry) and other high-flow rate applications. The CRFC20-BB reduces chlorine, chloramines, taste & odor, and particulates from your water.


20" CRFC20-BB features:

  • A radial flow design that offers low pressure drop, minimal carbon fine release, and extended cartridge life.
  • The huge radial cartridge of surface modified carbon provides the extended contact time that is required to properly convert chloramines into harmless chloride and nitrogen.
  • At common RO system incoming flow rates (less than 1g/min) the manufacturer has informed us the Pentek CRFC20-BB cartridge will last 75,000 gallons.
  • At a 3:1 waste to product water ratio this filter will produce almost 19,000 gallons of RO water.
  • We recommend this unit be used in conjunction with the Pentek ChlorPlus carbon blocks in your RO system.

20" CRFC20-BB Quick Specs:

  • 10,000 gallons of water at 5 GPM*
  • 25,000 gallons of water at 2.5 GPM*
  • 75,000 gallons of water at 1 GPM * (**)

* This cumulative filtered water and includes both product and waste water

** All of our RO and RO/DI systems operate at 1 GPM or less

More Information
Carbon Block Type Chloramines/Universal
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Product Questions

Would there be any benefit to putting a sediment filter before this block?
Question by: Alex Nadeau on Dec 6, 2021, 10:15 AM
Thank you for your question. The sediment filter will extend the life of the carbon blocks and prevent them from getting clogged.
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 9:34 AM
What size are the push to connect fittings? Is this able to be ordered with 1/2" push to connect fittings? If not what fittings would need to be ordered to change out the push to connect fittings to 1/2"?
Question by: Joshua Mahr on Feb 4, 2020, 9:16 AM
Hey there,

It will come with 1/4" connections. You need to change the reducing bushing from 1"-1/4" to 1"- 1/2". This can be found under our sch. 80 fittings.
Answer by: Thomas Billington on Feb 5, 2020, 2:10 PM
Do you sell just the plastic canister? Somehow mine cracked (hairline) and I used jb weld 16 but it’s still leaking a little and a bit of water is dripping from the top. I just replaced the filter cartridge which was pricy and the canister cracked within a week of the new cartridge so I don’t want to have it buy an entire new system. Any options? Thanks!
Question by: Kasey on Nov 12, 2017, 8:34 PM
We do offer replacement canisters that come with a new head and canister. You can either search our site for SKU 200901 or I also have a direct link below to the 20" Big Blue Canisters that the Chloramines Monsters use.
Answer by: Charlie on Nov 24, 2017, 2:12 PM
If I have upwards of 3-5 ppm of total chlorine (in form mainly of chloramines), then I can use only this monster cart and no other carbon carts is how I understand it. Right? So I would have the sediment basic block (no carbon in it) then the monster, then the RO then the DI. Just making sure. As I would love to get this and not worry for several years! it's a large upfront cost but I think it would pay for itself in like 2 years with as much chloramines I have. Thanks!
Question by: Lance Umansky on Jan 18, 2017, 7:16 AM
Hey there! You absolutely can set up your system like that and what a great way to save on hassle of changing filters on a more regular basis. I would recommend TDS meters, pressure gauges, and chlorine test strips to keep a pulse on the life of your filters. :-)
Answer by: Randy on Jan 20, 2017, 7:55 AM
It looks tall. How big is it exactly?
Question by: David Strand on Dec 7, 2016, 12:50 PM
Great question! These are specifically designed to fit 20" x 4.5" Big Blue RO Housings. The filter itself will be a bit smaller than those dimensions, but must be utilized in canisters that size. :-)
Answer by: Randy on Dec 7, 2016, 1:04 PM
What are the fitting/tubing size in and out of this unit?
Question by: Michael on May 16, 2016, 10:46 AM
Great question!
These will come with 1/4" connections. Feel free to let us know if you have any further questions!
Answer by: Connor on May 19, 2016, 12:28 PM
Where can I get a pre-filter. My sediment cartridge is almost Brown and it's only been one month
Question by: Millz on May 7, 2016, 5:19 PM
Great question,
There is not a solid pre filter other than more sediment filters. You can add an additional canister to the front of your unit and place in another sediment filter. Feel free to let us know if you have any further questions!
Answer by: Connor on May 10, 2016, 5:07 PM
I have your stage 4 rodi value system does that get rid of chloramine from water or do I need a filter for that also. But you don't sell any small chloramine single add on systems, or can I buy canister and filter for it and add to it. If so what would I need to get?
Question by: brian on Aug 21, 2014, 1:04 PM
Hi Brian,The easiest way to convert a standard 4 stage RODI system to one capable of removing chloramines would be to purchase an additional chamber along with the Chloramine conversion kit. The added chamber will hold the sediment prefilter and you can then install the carbon stages in the next 2 chambers while leaving the DI in the last chamber. I hope this helps!Have a great day :)
Answer by: Bulk Reef Supply on Aug 21, 2014, 1:04 PM
I just purchased this item and I was wondering the best way to plumb it into my RO unit.... Should it be first inline than into the RO unit or should I plumb the sediment filter, chloramine monster, than the MATRIKX Carbon Block....
Question by: Daniel on Feb 19, 2014, 3:26 PM
Hey Daniel,
With this unit most folks just install it first before the entire system.
Answer by: Bulk Reef Supply on Feb 19, 2014, 3:26 PM