The 3M™ Replacement Filter Cartridges Model AP2-C401-SG is a replacement cartridge using less plastic in construction and offering a smaller footprint. Our AP2 Series provides a Sanitary Quick Change (SQC) design that makes cartridge change-out simple – just a quarter turn of the cartridge to remove and replace. Within the range, a selection of media is available offering various filtrations. Select models offer scale inhibition to reduce calcium and magnesium hard scale formation on the heating coils. Other media reduce lead, parasitic protozoan cysts and select VOCs. Further models reduce scale forming minerals in the outlet water.