The replacement kit for the Apas Vital filtration system combines two water filtration technologies. Activated carbon technology as well as reverse osmosis technology. The set includes: 1) Inline solids filter 2.5″ 2) Inline active carbon filter Carbon Block 2.5″ 3) Inline Activated carbon filter + KDF 4) Reverse osmosis membrane TFC-50 F Filmtec 8 l/h The Aqua Filter reverse osmosis membrane removes from the water the contaminants that may be present in the water, such as lead, arsenic, barium, chromium, mercury , sodium, cadmium, fluoride, nitrite, nitrate and selenium.