The Culligan D-15 water filters are non-cellulose carbon filter cartridges, The Culligan D-15 replacement filter produces healthier, better-tasting drinking and cooking water, The Culligan D-15 water filter cartridges reduce odors, chlorine taste and odor, bad taste, and sediment, The Culligan D-15 water filter is tested and certified by NSF International to NSF/ANSI Standard 58 in model RO-3000 and RO-3500, The Culligan D-15 is recommended for use with city and well water supplies, The Culligan D-15 water filter dimensions are 9, 75"" x 2, 4"" x 2, 4"", The Culligan D-15 are 5 micron water filters, SKU: CWD057