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

Cartridge 2 - 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. These cartridges are the best quality and the same as supplied in our blue water purifiers.