Replacement Models -Replaces Filbur FC-0359, Pleatco PWW50P3, Unicel 6CH-940 and Waterway 817 0050, 03FIL1400, 25252, 378902 and PWW50 spa filter. STRONG FIT -Innovative 2-inch DustLock technology allows the fabric to absorb more contaminants than regular fabrics. This filter effectively removes hair, leaves, dust, sediment, sand and more. Enjoy a clean spa and hot tub break. More efficient filtration area -The spa filter Unicel 6ch-940 is made of polyester, easy to clean and replace, washable and reusable. The polyester fibers also help trap particles, increasing efficiency without causing pressure drop, helping to reduce filter cleaning frequency. LONG LIFE -Unique triangular filter fabric construction makes it easy to capture large volumes of interest. Cleaning/cleaning is easy and the filter can be re-maintained. This filter will last 1-2 years if properly cared for. Feature: Backing with highest fiber count, medium retains more dirt . Better flow, increasing filter life. Clean less frequently and lasts longer. Advanced Filter Cloth: More filter pleats means increased filtration capacity. The PWW50 spa filter is highly effective in reducing hair, leaves, dust, sediment and sand. Notes on Filter:< /p> Please do not allow hot water over 50 through the spa filter replacement. The filter element replacement time depends on the quantity and water quality. Please check that your existing filter part number or size matches this to confirm compatibility.