【Replacement Models】Directly replaces Filbur FC-0359, Pleatco PWW50P3, Unicel 6CH-940, and Waterway 817 0050, 03FIL1400, 25252, 378902, and PWW50 spa filters. 【Superior Filtration】Innovative 2-inch DustLock technology allows the fabric to absorb more contaminants than standard fabrics. This filter effectively removes hair, leaves, dust, sediment, sand, and more, ensuring a clean spa and hot tub. 【Efficient Filtration Area】The Unicel 6ch-940 spa filter is made from high-quality polyester, making it easy to clean, replace, washable, and reusable. Polyester fibers efficiently trap particles, increasing effectiveness without causing pressure drops, which helps reduce filter cleaning frequency. 【Extended Lifespan】Unique triangular filter fabric construction makes it easy to capture large volumes of debris. Cleaning is simple, and the filter can be maintained for extended use. This filter will last 1-2 years with proper care. 【Enhanced Performance】Features a higher fiber count backing that retains more dirt and provides better flow, extending the filter's lifespan. Clean less often and enjoy longer-lasting performance. 【Advanced Filter Fabric】More filter pleats mean increased filtration capacity. The PWW50 spa filter is highly effective at reducing hair, leaves, dust, sediment, and sand. 【Important Notes】Do not allow hot water over 50 degrees Celsius through the spa filter replacement. The filter element replacement time depends on the quantity and water quality. Please verify your existing filter's part number or size matches this one to confirm compatibility.