This is KleenWater brand high quality, low cost cartridge set compatible with Water Factory SQC-3 reverse osmosis system. This water filter cartridge set includes (1) KleenWater KWPSQC-2 sediment / carbon pre-filter which is compatible with Water Factory filter cartridge 47-55706G2. Also included is (1) KleenWater KWPSQC-4 carbon block filter which is compatible with Water Factory filter cartridge 47-55710G2. The KleenWater KWPSQC-5 Module / Membrane is the final component which is compatible with Water Factory 66-4706G2. This 2 cartridge pre-filtration set should be changed annually to adequately protect the reverse osmosis module and keep the system in peak performance. The module (membrane) should be changed when the total dissolved solids number becomes elevated or permeate water production is diminished. One of these circumstances is typically realized between 3-5 years. If you require the cartridge set without the module included please insert our model KWPSQC-2&4 in the Amazon search bar. KleenWater is a trademark of Pavel Water Filtration.