TOREAD spa filter cartridge TRF-6430 — fits Watkins 31489 / Pleatco PWK30, 10.5" x 5-7/8", 50-micron NSF

TOREAD TRF-6430 is a direct-fit replacement spa filter cartridge designed to restore clean, clear water by capturing fine debris and protecting your spa circulation system.

Built to match the dimensions and performance of Watkins 31489, Pleatco PWK30 and Unicel C-6430, this cartridge uses trilobal filtration fabric and reinforced end caps to improve dirt-holding capacity and resist damage from routine use. It installs like the original filter and is sized for common hot-tub housings, offering an affordable, certified option for maintaining water clarity and circulation.

How does this filter match my current Watkins or Pleatco cartridge?

The TRF-6430 is manufactured to the same key measurements and port sizes used by Watkins 31489, Pleatco PWK30 and Unicel C-6430, so it drops into compatible filter chambers without modification. TOREAD lists the cross-reference part numbers for easy compatibility checks.

• Length: 10 1/2” to fit standard housings
• Outside diameter: 5 7/8” for proper seal seating
• Top/bottom openings: 1 15/16” to match plumbing connections
• Works as a direct replacement for listed model numbers

What level of filtration and debris capture can I expect?

This cartridge uses a tri-lobal synthetic fabric engineered to increase surface area and trap finer particles. With an effective media precision near 50 microns, it removes hair, sand, sediment and organic debris that commonly cloud spa water.

• Rated filtration area: 30 square feet for improved dirt capacity
• Approximately 50-micron capture for fine particulates
• Enhanced surface texture reduces pressure spikes in the system

How long will the TOREAD TRF-6430 last and how do I care for it?

The cartridge is built with thicker trilobal fabric and reinforced, chlorine-resistant end caps to extend usable life relative to many standard replacements. Regular monthly rinsing and occasional deep clean will maintain flow and extend service life, but avoid backwashing—this cartridge is not designed for that process.

• 25% thicker filter media versus basic cartridges
• Resistant end caps to reduce cracking from handling and chemicals
• Recommended monthly rinsing; deep clean when pressure rises

Is this filter certified and safe for spa water?

TOREAD TRF-6430 has been tested and certified by IAPMO to NSF/ANSI 50 standards, meeting recognized safety and material guidelines for pool and spa components. The certification helps ensure the cartridge uses materials suitable for recreational water systems.

• IAPMO-tested and NSF/ANSI 50 certified materials
• Manufactured by TOREAD, an independent brand and PHTA member
• Designed for repeated service with industry-recognized quality controls

Who this replacement is for: owners of spas or hot tubs using Watkins 31489, Pleatco PWK30, Unicel C-6430 or compatible cartridges who want a certified, longer-wearing spare at a reasonable price. It’s ideal for homeowners maintaining regular filtration schedules, service technicians stocking common replacements, and anyone looking to improve dirt-holding capacity and reduce filter-change frequency while keeping plumbing and seals aligned with factory specifications.