Smart Spa Supply YZ683E. Spa Filter Cartridge Compatible with Unicel C-8325 125Sq.ft FC-2790 PSD125U Sundance c8325 Guardian817-199 Darlly 81254 1PackPowerful Filtration Performance: The unique trilobal fabric captures much more contaminants than regular fabric, which can efficiently removes hair, leaves, dust, sediment, sand, etc. DimensionsLength: 18", Outside Diameter: 8 7 16", Top: closed w 3 step edge, Bottom: 2 1 2" open w beveled edge, Filter Area: 125 sq. ft Professional&Reliable: Yoozell filters are made by Industry specified premium filtration fabric according to the strict standards and