This replacement filter cartridge comes with a technical specification of Unicel # S7M400 and OEM # S7M400. It is a high performance filter cartridge with 25022-0224S, 25021-0223S inner and outer pieces. This state of the art filter is of superior quality as per industry standards. It efficiently provides you dust, sand and worm free clean and clear water solution for your pools and spas. The best in the industry this product matches all your water purifying needs and offers quality with cleanliness and hygiene par excellence