We are one of the largest suppliers of the highest quality of compatible Culligan AC30 filter set replacements. It's recommended to change your pre-filters every 6 months. This set includes: (1) 5 Micron Sediment - Sediment filter made with 100% high purity polypropylene. (1) 5 Micron Carbon Block Filter - Filter Carbon Block made from high purity coconut shell. IPW Industries Inc filters are fully compatible with the Culligan original cartridge but with a noticeably distinctive design. Flat bottom with no nipple, to rest on the top of the sump cup. To maximize filter system performance, be sure to replace approximately every six months, depending on local water quality. These filters fit the following Culligan Systems Culligan AC15 Culligan AC30 Culligan H83 Culligan H83S-R Culligan LC50 These filters are compatible replacements for: Culligan 00402808 Culligan 00448763 Culligan 0100078 Culligan 01000827 Culligan 01000078 Culligan 01004291 Culligan 01012580 Culligan 4027-96 Culligan 4028-08 Culligan 4487-62 Culligan 4487-63 Culligan 4496-28 Culligan 00-0011-38 Culligan 00-4027-96 Culligan 00-4028-08 Culligan 00-4487-63 Culligan 01-000-78 Culligan 01-0008-27 Culligan 01-0000-78 Culligan 01-0042-91 Culligan 01-0125-80 Culligan 00001138 Culligan 402796 Culligan 402808 Culligan 448762 Culligan 448763 GA 328635 KX Matrix 32-175-050-100 Omnipure RS-22-CB5-EB, RS22CB5EB This is not a OEM product. The brand names and logos are the registered trademarks of their respective owners. Any use of the brand name or model designation for this product is made solely for purposes of demonstrating compatibility.