Includes 2 cartridge compatible set to replace compatible with Ionics G11 & G12 The membrane is not included Includes (1) KWPSQC-2 sediment/carbon pre-filter , (1) KWPSQC-4 carbon block filter Made in USA This is a "high quality - low cost" cartridge set for the Ionics G11 & G12 reverse osmosis system. This water filter cartridge set includes (1) KWPSQC-2 sediment / carbon pre-filter which is a compatible replacement to Water Factory / Ionics filter cartridge 47-55706G2. Also included is (1) KWPSQC-4 carbon block filter which is a compatible replacement to Water Factory / Ionics filter cartridge 47-55710G2. . 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 with the module included please insert our model KWPSQC-2-4-module-Ionics in the Amazon search bar.