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If you have a 3-canister CHLORAMINE FLUORIDE PLUS unit from us, this is the bundle of the THREE replacement filters you need.

One cartridge is to remove fluoride, and has a sediment filter - the FR-1.

Another cartridge targets chloramine in particular, using kdf-85 and catalytic carbon, both of which are optimized for removal of chloramine.   CR-1

The third cartridges is the standard wide-spectrum, deep filtering replacement filter cartridge filters that have 2 sediment filters, copper-zinc kdf 55 and granulated carbon filtering media. It filters a wide range of contaminants, including chemical and organic-based.  KR101N

It is recommended that you swap filters out once a year. Some people in LA change the filters more often.

The size of the filters is 3 1/16 across and 9 1/4 tall. If you got your canisters from us, this are the right replacements for a three-canister CHLORAMINE FLUORIDE PLUS unit whether it is a Countertop or Undercounter unit.

The cartridges say 'up' to indicate the top side IN AN UNDERCOUNTER CANISTER. IN A COUNTERTOP UNIT, put the 'up' end into the base. (Just put the in the same as the ones you are taking out.)

If you are wondering if you can use this in your system from another supplier, the answer is not necessarily. The cartridges must be identical in size and shape to work. Our normal warranty does not apply to replacement filters used in another supplier's housing.