POOLPURE Spa Filter Cartridge PLFC-8465-M — Watkins 31114 Replacement, 65 sq ft Trilobal

POOLPURE PLFC-8465-M is a direct-fit replacement spa filter cartridge engineered to match Watkins 31114 performance with 65 square feet of trilobal filtration for clearer spa water.

The PLFC-8465-M cartridge is built to provide dependable filtration for hot tubs and spas that use the Watkins 31114 family of filters. Constructed with a multilayer trilobal filtration fabric and designed to fit common OEM housings, this cartridge balances high debris-capture capacity with easy maintenance. It meets NSF/ANSI 50 testing standards and is produced by POOLPURE as a compatible replacement rather than an original equipment manufacturer part.

How does this cartridge improve water clarity for my spa?

The PLFC-8465-M uses advanced Dirt-Locking media that traps a high volume of fine particles, hair, and sediment so water stays clearer between cleanings. Its 65 square feet of filter area increases contact time, letting the cartridge pull out more contaminants than smaller units.

• 65 sq. ft. filtration area for extended debris capture
• Trilobal fabric structure captures fine particles and organic matter
• Engineered to trap over three times more debris versus basic cartridges

Will this fit my Watkins or Unicel spa model?

The PLFC-8465-M is sized to replace Watkins 31114 and compatible Unicel C-8465 and equivalent models listed by manufacturers. Before ordering, compare your current cartridge’s length and opening diameters to ensure a match.

• Length: 10.5 inches; Outer diameter: 8.5 inches; Top/bottom openings: 3 inches
• Compatible with Watkins 31114, Unicel C-8465, Filbur FC-3960, OEM 31114 and others
• Designed as a drop-in replacement for many Tempo, Rhythm, Relay spa systems

How do I clean and maintain this replacement filter?

The trilobal fabric releases trapped debris easily when rinsed, helping restore flow without aggressive treatments. Routine monthly rinsing keeps performance high; avoid backwashing and inspect for wear annually to know when replacement is needed.

• Rinse with a pressure washer or hose monthly for peak performance
• Do not backwash — it can damage the cartridge structure
• Replace when pleats show permanent staining, tears, or reduced flow

What certifications and endorsements support this filter’s quality?

The cartridge has been evaluated to meet NSF/ANSI 50 filtration performance standards, and POOLPURE participates in industry organizations to maintain quality and consistency. The brand also supports competitive aquatic programs and has been used in rigorous training settings.

• NSF/ANSI 50 tested to industry filtration criteria
• Pool & Hot Tub Alliance (PHTA) member for recognized standards
• Field-tested in athletic training environments for reliable operation

Who is this for? If you own a hot tub or spa that specifies a 65 square foot Watkins 31114-style cartridge and you want an NSF-tested, easy-to-clean replacement with strong debris capture, the PLFC-8465-M is built for you. It’s suited to homeowners who prefer routine maintenance over frequent cartridge swaps, facility operators who need dependable filtration in heavy-use settings, and anyone seeking a cost-effective compatible alternative to OEM parts. Always verify dimensions and compatibility before purchase to ensure a correct fit.