The TO1 is a carbon wrapped cartridge for the industry's best-selling Whole House water filter, Model U25. The TO1 also fits OMNI Whole House filters OB1 and OB5 as well as the older models, R12, R14 and Omni Regular Whole House water filters.  By reducing sediment and chlorine in incoming water, the TO1 provides clean water to every faucet and appliance in your house. This cartridge replaces the TO1 SS and DS.

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.

Change cartridge filter every 3 months. Change O-Ring with every 3rd filter change.
TO1 Cartridge - For OB1, OB1Series A, OB5, OB5 Series A, U25 and U25 Series C K4 O-Ring - For OB1, OB1Series A, OB5 and OB5 Series A Filters OK25 O-Ring - For U25 and U25 Series C Filters	OW1 Tank Wrench - For OB1 filter OW2 Tank Wrench - For U25  and U25 Series C Filters WC-792P Tank Wrench - For OB5 Filter OW40 Tank Wrench - For OB1Series A and OB5 Series A Filters

Click On Links For Tank Wrench and Replacement O-Rings

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: (406) 889-5288 for assistance.

Also called T01, TO1 or TO 1 DS replacement cartridge