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Cartridge  CB3A  -  Alternate Cartridge for Older CBF3 Units and OT32 Units
The CB3A is the Alternate Cartridge for the older Units needing the original size CB3 Cartridge and it the highest performance carbon block cartridge on the market today. It is used in older OMNI Undersink filters CBF3, OT32, and OB3. The CB3A's carbon block removes chlorine and odors, harmful bacteria like Giardia and Cryptosporidium, lead, and volatile organic compounds (VOCs) like Atrazine (a herbicide) and Lindane (a pesticide), as well as 32 other VOCs, to give you great tasting, safe drinking water right from the tap, or from a dedicated faucet, depending on the unit selected.

This cartridge is a Smaller Sized Alternate Cartridge for the older CBF3 and OT32 OmniFilter Units that need the smaller, older style of CB3 cartridge.  
(*You may upgrade to a new filter unit or use this cartridge)

Need Help? Please call our customer service number: (855) 855-1976 for assistance. 
Change cartridge filter every 4 months.  CB3 Replacement Instructions
CB3  Cartridge - For CBF3, CBF3 Series A and for CBF3 Series B
and the OT32, OT32 Series A, and OT32 Series B Filter units

K4 O-Ring* - For CBF3, CBF3 Series B,  OT32 & OT32 Series B

OW1 Tank Wrench - For CBF3 & OT32

OW30 Tank Wrench - For CBF3 Series B & OT32 Series B

NOTE: California Residents & Anyone with an Older Unit using a CB3
Due to California Law, we are unable to sell you the current, new Omnifilter CB3 - V2.87.  We found a compatible California Certified Cartridge and will send that to CA residents instead.   Order the California CB3C Directly Here.   Or use the CB1C Cartridge 

ALSO NOTE: The Newer CB3B is larger than the old CB3A and the CB3B will not fit in the older units.
Our CB3B has a slightly larger diameter than the new CB3 and it will NOT fit your older OT32 and the other older OmniFilter Units.  Order the Larger CB3B here - if you have a Newer unit.



Replacement Cartridge

for older OmniFilter Units

CB3A Pricing 
QTY 1 at $39.94 each  
QTY 2-5 at $37.04 each 
QTY 6+ at $33.15 each 

  CB3A - ORIGINAL SIZE ALTERNATE (Smaller)  $39.94
   CB3B For New CBF3 Series C OmniFilters
   CB3C for California Residents

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** We recommend using fresh
Lubricant with every
cartridge change
and every o-ring change.


Help - What Oring do I need?

plumbing fittings

  K4 O-ring + $3.95

 O-Ring Lubricant $.49
** Adding Lubricant.

(if selected above)



- Help - 
What wrench do I need?

  Universal Strap Wrench 
+ $19.99 (fits all Omni filters)

  OW1 Wrench + $19.99
(Strap Wrench fits all Omni filters)

  OW30 Wrench + $7.99

(if selected above)



Model CB3
Filter type Carbon Block
Reduces: Rust & Sediment (Class I)
  Odor & Chlorine (98%)
  Lead (97%) Mercury, Asbestos
  Cryptosporidium & Giardia Cysts (99.99%)
  VOCs (97-99%) - Including Atrazine & Lindane   MTBE 
Benefits Reduces lead, Cryptosporidium and Giardia cysts, and 34 VOCs at 97% or better. Also removes chlorine and odors to give you great tasting water.
Average Cartridge Life 1 400 gal
Flow Rate2 0.5 gpm
Micron Rating 3 0.5

1 Usage and the quality of water in your incoming line determine when your cartridge should be changed.
2 Gallons per minute.
3 The smaller the micron, the finer the filtration.


Click On Links For Tank Wrench and Replacement O-Rings Information

Installation Information

If you have an older Omni filter model that has been discontinued and need an O-Ring, please call our customer service number: (855) 855-1976 for assistance.


The CB3 filter cartridge replaces the TC3 or TC 3 filter cartridge.

Also called CB3 or CB 3 filter cartridge.

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NOTE: as of 2008, the design of the CB3 has changed again. The CB3 will now be open at both ends. Another major difference is that this newer version will last longer (up to 6 months).

If you receive a new model and you are unable to close the top of your housing, please remove the o-ring(s) from the new filter and use the ones from the old filter, as the new ones may be thicker. This should allow you to close the lid on the housing.




Call Us toll free (855) 855-1976

E-mail info@envirotechproducts.com

We are not associated with Envirotech Products Incorporated of Mulvane Kansas          02242014