FC-2971 Neptune Spa Filter – 75 sq. ft. Cartridge (PLBS75, C-5374, NC652971)

The Neptune NC652971 cartridge is a 75 sq. ft. replacement filter for spas and a direct equivalent to the Pleatco PLBS75. It fits most Cal Spas, Maax, Leisure Bay (S2/G2), Waterway, and Rainbow spas that use a cartridge with 14 3/4 in. openings at both ends.

Specifications

• Filter area: 75 sq. ft.
• Dimensions: 14 3/4 in. high × 5 5/16 in. diameter (37.5 cm × 13.5 cm)
• Openings: 2 1/8 in. (5.4 cm) at the top and bottom — no handle or threads
• Filter media: 3 oz/yd² nonwoven polyester with high-density fibers to capture fine particles without restricting flow
• Construction: reinforced center core and break-resistant end caps
• Washable and reusable — simply rinse with a garden hose

Equivalent Part Numbers

Direct replacements: Pleatco PLBS75 · Unicel C-5374 · Filbur FC-2971 · Darlly 50651 · Baleen AK-40081 · OEM 817-0015, 303433, R173600, and 107092.

Compatible spa brands and models:

• Cal Spas (models with 75 sq. ft. LP filter)
• California Cooperage
• Clearwater Spas (Beachcraft and Resort series)
• Elite Spas
• Leisure Bay (S2, G2, and Emerald series — 75 sq. ft. filter)
• Maax Spas
• Pentair / Rainbow Plastics
• Rec Warehouse
• Waterway Plastics (75 sq. ft. Top Load Skim Filter)

Before ordering, always compare the dimensions or part number of your current cartridge with the list below.

Maintenance

Rinse the cartridge every 2 to 4 weeks and soak it in cartridge cleaner once per season. A well-maintained cartridge typically lasts 12 to 18 months. We recommend keeping a second one on hand so you can soak one without ever having to shut down the spa.

Check the dimensions of your current cartridge before ordering. Have a question about compatibility? Send us a message and we'll confirm the right model.