Shake off the summer heat in a cool pool. Make a splash in the cleanest swimming pool in the neighborhood with Unicel 100-Square-Foot 23-Inch Long Pool/Spa Replacement Filter Cartridge. When it comes to pool maintenance do it right with this high-quality replacement filter. Easily install into the skimmer for better water quality at an instant. Whether your filter gets jammed with algae sand leaves or more this filter delivers quality results. Measuring 8.4-inches in diameter and 23.4-inches in length this filter cartridge features open-ended top and bottom end cap with 4-inch inner diameters. With 143 pleat count 4-ounce filter media and a 100-square-foot filter area spend less time cleaning and more time enjoying your pool with this efficient filtration system. Canon-ball into summer with Unicel Replacement Filter Cartridge.