POOLPURE spa cartridge filter PLFC-6430-M — 30 sq ft trilobal media, fits Watkins 31489 / Filbur FC-3915M

If your spa or hot tub needs a reliable cartridge that fits Watkins 31489 or Filbur FC-3915M plumbing, the POOLPURE PLFC-6430-M offers a high-surface-area media and manufacturer-grade tolerances. Designed as a compatible replacement, this cartridge balances filtration efficiency with easy upkeep so you get clearer water without fussing over complicated parts. It meets tested safety standards and is built from multilobal fibers that trap fine particles while maintaining consistent pressure across your system.

How does the PLFC-6430-M improve water clarity?

The PLFC-6430-M uses trilobal filtration fabric to increase surface area and capture finer debris than standard pleated media. That means less visible dust, hair, and plant matter in your spa with sustained flow rates, so pumps work efficiently and water stays clearer between cleanings.

• 30 square feet of filtration area for extended dirt-holding capacity
• Trilobal fiber geometry captures finer particles down to roughly 50 microns
• Precision pleating reduces pressure spikes and maintains circulation

Will this cartridge fit my Watkins or Filbur spa model?

The PLFC-6430-M is manufactured to match the critical dimensions of Watkins 31489 and Filbur FC-3915M replacements, making it compatible with many common models. Check the printed dimensions against your existing cartridge to confirm a proper fit before ordering.

• Length: 10 1/2"; Outside diameter: 5 7/8"
• Top/bottom opening: 1 15/16"; Filtration area: 30 sq. ft.
• Works with several listed part numbers (for reference only)

How easy is maintenance and cleaning?

POOLPURE engineered the fabric to release trapped debris more readily during rinsing, so routine maintenance stays quick and predictable. Monthly rinsing is usually sufficient for typical backyard use, though frequency depends on bathing load and local conditions.

• Uniform trilobal fabric sheds trapped particles during spray cleaning
• Simple rinse or soak cleaning extends usable life between replacements
• Follow monthly checks for optimal performance and pump health

What safety and performance standards does this cartridge meet?

This cartridge has undergone industry testing and meets recognized material-safety benchmarks to ensure reliable use in pools and spas. It’s manufactured by POOLPURE, a member of industry organizations and tested to accepted filtration criteria that focus on safe materials and consistent particle removal.

• IAPMO-tested to NSF/ANSI 50 standard for material safety
• Designed to remove common contaminants like hair, sand, sediment, and organic debris
• Built to industry specifications for interchangeability and performance

Who this is for: The POOLPURE PLFC-6430-M is ideal for spa and hot tub owners who need a dependable, easy-to-clean cartridge that matches Watkins and Filbur legacy part sizes. It suits seasonal homeowners, rental property managers, fitness centers with spa features, and anyone wanting consistent circulation and clearer water without specialty parts. If you value tested materials, straightforward installation, and longer time between cleanings, this replacement cartridge is designed to fit into common systems and keep your spa running smoothly.