19 sq. ft. top load.
1-1/2" MPT thread has an approximate outside diameter of 1-13/16".
4CH-21 replaces: Filbur FC-0121 UPC 645544001214, FC-0136 UPC 645544001368. Pleatco PA13, PA17, PTL18P4-4, UPC090164999333. Aladdin 11901. OEM 20245-238, PVT 25N. Unicel UPC 678285240031.
Commonly used in: Alcove, Atera Spas, Dream Maker Spas, Pageant Spas, Saratoga Spas & Vita Spas.
PuraSpa® Filters are quality pleated filters, made with Reemay® Filtration Fabric. We may substitute with Unicel® brand filters, another quality hot tub filter.