This replacement filter cartridge comes with a technical specification Unicel # C-3303 and OEM # C3303. This product can handle a top load of 2 Sq. Ft. and is a high performance filter cartridge. This state of the art 2 sqft Aqua Leisure filter is of superior quality as per industry standards. This filter comes 1-13/16" open hole at the top and the bottom. It is 3 1/8" in length and 3-1/4" 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.