General description Pack Spa Filters are designed for Unicel 6CH-940, PWW50, Waterway Front Access Skimmer, and Filbur FC-0359. These filters utilize innovative "dirt collection" technology, allowing the fabric to absorb more impurities than standard fabrics, ensuring powerful filtration performance. Technical specifications Length: 21 cm Outer diameter: 15 cm Top: round handle Filtration area: 45 square meters Other information