AQUALTRA Hot Tub Filter 2-Pack — 7 5/8" x 6" Screw-In 1½" SAE, Washable NSF-Certified

The AQUALTRA 6CH-940 is a washable, NSF-certified replacement screw-in hot tub filter (7 5/8" x 6", 1½" SAE thread) sold as a convenient two-pack for easy swap-outs.

This pair of AQUALTRA spa filters is designed to match common OEM part numbers (for compatibility only) and deliver reliable mechanical filtration for hot tubs and small pools. Built with a PET composite media, a chlorine-resistant end cap and a polypropylene core, the cartridges are free of BPA and meet NSF/ANSI material standards, giving you confidence in construction and chemical durability.

How will this filter affect water clarity and debris capture?

The AQUALTRA cartridge uses a dense pleated fabric and a proprietary "dirt-locking" design to trap finer particles than many basic filters. It captures hair, leaves, dust, sediment and sand before they recirculate, which helps maintain clearer water between cleanings.

• Multi-layer PET composite media for increased contaminant retention
• Deep pleats to increase surface area and extend run time
• Reduces visible particles and protects pump and heater from grit

Is this filter easy to clean and reuse?

Yes — the cartridge is designed for repeated rinsing instead of single-use disposal. Its durable fabric stands up to regular hosing, letting you extend the filter's service life while keeping maintenance simple.

• Washable pleats rinse clean with a garden hose
• Recommended cleaning interval: about once every 2 weeks under normal use
• Remove filter before soaking in strong chemicals to avoid corrosion

Which tubs and part numbers does this unit fit?

The filter measures 7 5/8" length with a 6" outer diameter and a 1½" SAE screw-in bottom. It is compatible with models that accept PWW50P3-style cartridges and several listed OEM references, but confirm your current filter size and thread type before purchase.

• Outer diameter: 6" — Length: 7 5/8"
• Top style: circular handle — Bottom: 1½" SAE threaded
• Common compatibility: PWW50P3 (not PWW50P4), FC-0359, Waterways 817-0050 and similar part numbers

How durable and safe is the construction?

The cartridge combines NSF-certified materials chosen for chemical resistance and longevity. A chlorine-resistant end cap and a rigid polypropylene core support the pleated media so it holds shape during repeated cleanings and routine hot tub chemistry.

• BPA-free PET composite filter media
• Chlorine-resistant end caps for extended life
• NSF/ANSI material certification for trusted components

Who is this for? The AQUALTRA 6CH-940 two-pack is aimed at hot tub and small spa owners who need reliable, reusable replacement cartridges that match common OEM sizes. It's a good fit if you want NSF-certified materials, straightforward maintenance, and a cartridge that captures everyday debris while protecting equipment. Before ordering, verify your hot tub’s filter dimensions and thread type to ensure a proper fit. If you have questions about compatibility or care, AQUALTRA offers customer support to help match the filter to your system.