The Tier1 PAS-1131 is a compatible replacement for the Pleatco PAS35SV-F2M, Unicel C-4335, and Filbur FC-2385 cartridges. It is engineered to fit Saratoga Spa and several other spa models that use a 4-15/16" diameter cartridge with 35 sq. ft. of filtration area, 8-1/4" length, and 1-13/16" open top/bottom end caps. Always confirm your OEM part number before ordering to ensure a proper fit.

The Tier1 PAS-1131 features a reinforced polyester media with a micron rating designed to capture fine debris, dirt, oils, and contaminants typical in spa water. With 35 square feet of pleated filter area, it provides efficient flow and extended dirt-holding capacity, helping maintain cleaner, clearer spa water while reducing strain on your pump and heater.

The Tier1 PAS-1131 typically lasts 12 to 15 months with proper maintenance, depending on spa usage, bather load, and water chemistry. For optimal performance, rinse the cartridge every 2 weeks and perform a deep chemical soak every 3 months. Replace immediately if you notice reduced water flow, visible damage to pleats, or persistent cloudy water even after cleaning.

To clean your PAS-1131, remove it from the spa housing and rinse between the pleats with a garden hose from top to bottom to dislodge debris. For deeper cleaning, soak the cartridge in a dedicated spa filter cleaner overnight, then rinse thoroughly and allow to air dry before reinstalling. Avoid using dishwashers or harsh chemicals like bleach, which can degrade the polyester media and shorten filter life.

Yes, the Tier1 PAS-1131 is constructed with durable reinforced polyester media, break-resistant end caps, and a rugged inner core designed to withstand the heat and chemical exposure of spa environments. Tier1 manufactures this cartridge to meet or exceed OEM specifications, providing reliable filtration performance at a more affordable price than name-brand alternatives.