PWW50 Spa Filter replacement for Unicel 6CH-940

This spa filter cartridge replaces common PWW50-style elements and helps keep hot tub water clearer for longer, reducing hair, leaves and fine sediment. It suits routine maintenance of small to medium hot tubs and comes as a two-pack for easy rotation between cleans.

Key Points

The cartridges use a multi-layer fabric that traps more debris than single-layer alternatives, according to the manufacturer, and the increased number of pleats expands the effective filtration area for improved performance. The design includes a semi-circular handle that resists breaking and a robust ABS inner core to support high flow while keeping pleats evenly separated. Consider that heavy oils or large amounts of sunscreen may still require occasional chemical balancing to protect overall water quality.

Technical Specifications

• Name: PWW50 Hot Tub Filter (2 pack)
• Length: 9 1/2" (24.1 cm)
• Outside diameter: 6" (15 cm)
• Filtration area: 45 sq. ft.
• Bottom thread: 1 1/2" (3.8 cm) SAE

Benefits

The triple laminated poly-constructed inner scrim topped by a weather-resistant coating improves durability and helps the fabric tolerate higher temperatures and chemical exposure. This structure, coupled with Dacron fibres in the outer layers, makes it easier to capture fine particles without causing a significant pressure rise across the cartridge. The result is a filter that requires less frequent cleaning while maintaining flow, which helps pumps run more efficiently and may reduce strain on circulation components.

Pleat density and the reinforced core support sustained flow rates during extended soak sessions, so you can enjoy uninterrupted use. ⚙️ The break-resistant handle simplifies removal and replacement, especially when filters are wet and slippery. For households that share the spa, having two cartridges allows one to be rinsed while the other is in service, extending the effective interval between full cleanings.

Usage Recommendations

Rinse the cartridge regularly with a garden hose to remove loose debris and perform a deeper chemical soak periodically according to hot tub care practices. Avoid abrasive brushes that could damage the fabric and reduce filtration efficiency. If you notice a persistent increase in pump noise or a marked drop in flow, check the cartridge and replace it if cleaning does not restore normal conditions. 🧼

For compatibility, this cartridge is listed as a replacement for PWW50-P3, Unicel 6CH-940 and Filbur FC-0359, which may simplify sourcing if you currently use those models. 🔧