The 3M Aqua-Pure Under Sink Full Flow Replacement Water Filter Cartridge AP Easy C-Cyst-FF is one option in a complete product portfolio delivering cleaner, clearer drinking water. This replacement water filter cartridge is NSF listed to reduce particulate, chlorine taste, odor and parasitic protozoan cysts. The C-Cyst-FF cartridge is for use with the AP Easy Cyst-FF water filtration system. Our 3M Aqua-Pure Under Sink Full Flow Replacement Water Filter Cartridge AP Easy C-Cyst-FF is for use with the AP Easy Cyst-FF system which installs under the kitchen or bathroom sink and is one of several options in a complete product portfolio delivering cleaner, clearer, better tasting drinking water. The AP Easy Cyst-FF system and AP Easy C-Cyst-FF replacement cartridge provide water filtration on demand for drinking (water, coffee, tea, baby formula, etc.) and for cooking. This AP Easy C-Cyst-FF under sink full flow replacement water filter cartridge is NSF listed to reduce particulate, chlorine taste and odor and parasitic protozoan cysts. Our 3M Aqua-Pure AP Easy C-Cyst-FF replacement cartridge also reduces sediment*. The universal system design allows for use on both chlorinated (municipal) and non-chlorinated (well water) systems.