This product is of "fair use" and is compatible with the AC-15, AC-30, and AC-50 systems that are made by Culligan. Additional Details ------------------------------ Bullet point: ?ABOUT PRODUCT: It is a package of 4 that includes 1x Sediment, 1x Carbon Block, 1x In-Line Carbon Water filter cartridges, and 1x Membrane that are compatible with AC-30 water filter cartridges. It has a larger surface area and a longer filter life. This water filter Set removes more pollutants by providing "depth" filtering. Product description: CFS ? Replacement Water Filter Set Includes Carbon Block, Sediment Inline Cartridges Compatible with AC-30 Reverse Osmosis System Models ? Removes Bad Taste Odor COMPLETE FILTRATION SERVICES EST.2006 (CFS) is known for its quality, superiority, and effectiveness. Our customers mean everything to us. We never compromise on the quality of our products, and each product is individually inspected by us. We provide high quality replacement water filter cartridges. The primary purpose of our sediment replacement filter cartridge is to remove big and tiny particles such as sand, dirt, silt, and rust from drinking water. Our water filter cartridge assists in the removal of pollutants contained in tap water. If you don't filter your water properly, you and your family could be drinking water that is harmful to your health. PRODUCT SPECIFICATION: ? Brand: Complete Filtration Services ? Item Name: Water filter Set ? Material: Carbon ? Package: 4 Pieces ? Color: White PRODUCT FEATURES: ? Compatible with AC-30 Reverse Osmosis System Models. ? High quality replacement water filter cartridges. ? The cartridges provide high dirt holding capacity and superior sediment filtration. ? It is a package of replacement water filter cartridges with Membrane.