Salt-Free Water ConditionerDescription Water Travels Through 4 Stages of Filtration Stage 1: Water flows through a 20 sediment filter cartridge that removes sediment, silt, sand, and dirt. Stage 2: Water flows through a Crystal Quest Eagle Anti Scale media tank. Stage 3: Water flows through a 20 solid carbon cartridge for removing volatile organic carbon compounds (VOCs), insecticides, pesticides, and industrial solvents.* Stage 4: Water passes through a 20 0. 2 micron