This replacement filter cartridge comes with a technical specification Unicel # FG-3919 and OEM # 23900-0145. This product is a high performance filter cartridge. This state of the art Swimquip DE Filter (center port) filter is of superior quality as per industry standards. This filter is 18" in length and 19 5/16" wide. 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.