REPLACEMENT FILTER - Compatible with Pleatco: PFF25TC-P4, Unicel: 4CH-23, Filbur: FC-2400. Used in pools and spas made by Freeflo Spas and other manufacturers. Alternate Filter Names: Claro | CLX | FF-100 | SAC0007 | 17-175-1961 | PFF25-TCP4 | PFF25-TC W/ PAD-4. DIMENSIONS - This closed top filter features a 1 1/2 inch (1.5") MPT thread bottom, a 4 5/8 inch (4.625") diameter and 6 5/8 inch (6.625") length. The filter material contains 19 square ft. of REEMAY premium spunbond nonwoven filter material for better filtration. 2 PACK SAVINGS - Choose from our single pack or save even more with our 2 pack filter bundle. Having 2 filters on hand can help extend the life of each and protects your pool or spa because you can keep 1 filter active while cleaning the other for zero filtration downtime. EASY TO CLEAN - Guardian Filtration Products are designed to be long lasting and easy to clean so you can keep your pool and spa crystal clear and safe for you and your family. Our premium spunbond filter fabric and cartridge caps are chemical and chlorine resistant. USA MANUFACTURER - Our USA based manufacturing facility has been operating out of Northwest Pennsylvania since 2003. We're committed to creating affordable, high quality pool filtration products and accessories...Click Add-to-Cart or 1-Click Buy to order your pool/spa filter cartridge today!