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Cartridge GAC1   

The GAC1 is an activated carbon cartridge used in OMNI Undersink Models SFM2, UC2, OB3 and U400. The GAC1 removes sediment, chlorine and odors to give you great tasting water right from the tap, or from a dedicated faucet, depending on the unit selected. 

If you have an older Omni filter model that has been discontinued and need O-Rings or cartridges, please call our customer service number: (888) 855-3545 for assistance.
Note: The new style of GAC1 filter cartridge will fit older models of Omni filter units
Change cartridge filter every 1 year or 2,000 gallons.
Change O-Ring with every 3rd filter change.
GAC1  Series Data:
The GAC1 Cartridge fits: OmniFilter SFM2, and discontinued models: UC2, OB3 and U400

For OB3, SFM2, SFM2 Series B, UC2 & U400 Filters

K4 O-Ring* - For SFM2, SFM2 Series B & OB3 Filters

U24 O-Ring - For UC2 & U400 Filters and others

OW1 Tank Wrench - For SFM2, OB3, UC2 & U400 Filters

OW30 Tank Wrench - For SFM2 Series B Filter

GAC1 Replacement Cartridge

Our Price $9.99 (single)
Qty 2 at $8.87 each
Qty 6 at $7.93 each


Additional  Orings For all Omni Systems

Need help finding the right oring?

Qty: Add Extra K4 Orings + $3.95
Qty: Add Extra OK50 Orings + $3.95
Qty: Add Extra OK25 Orings + $3.95
Qty: Add Extra OK7 Orings + $3.95
Qty: Add Extra U24 Orings + $3.95

ADD Extra Wrench?
 More Info Link

Qty: Add Universal Tank Wrench + $19.99

(NOTE: Use the strap wrench below for any and all Omni filters current, discontinued* or older units)

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Tank Wrench and O-Rings

Installation information

GAC1 Cartridge Information and Data - Get More Data or Purchase Other Cartridges Separately Here 

Model GAC1 Series C 
Filter type Activated Carbon
Reduces: Rust & Sediment
Reduces: Odor & Chlorine (93%)
Benefits Removes chlorine and odors to provide great tasting water.
Average Cartridge Life 1 1 year or 2,000 gal
Flow Rate2 1.0 gpm
Micron Rating3 20

Buy a GAC1


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. 

Also called Omnifilter GAC1 or GAC 1 or GAC 1 SS replacement cartridge and GAC1 SS, GAC1 SD and GAC 1SD - OmniFilters - Omni Filters - Omni Water Filters. This cartridge replaces the GAC1 SS and DS, Series A and Series B.

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Rexford, MT  59930


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