Cartridge 1 and 2 - The pre-filter is a Sediment filter for removal of sand, silt, dirt and rust particles. This acts to prolong the life of the solid carbon filter.

Cartridge 3 - The carbon filter removes chlorine, chloramine, pesticides, chemicals, insecticides and minimal heavy metals.  This is a solid carbon filter not to be confused with GAC (granulated activated carbon) or cheaper versions.

Cartridge life is 8-10,000 gallons.