AQUALTRA Hot Tub Screw-In Filter Cartridge PWW50L Compatible, 5" x 13 1/16" 2-Pack — Washable PET Media, 2" SAE Thread

The AQUALTRA PWW50L-compatible hot tub filter is a washable, screw-in 5" x 13 1/16" cartridge designed to replace models like 4CH-949, FC-0172, SD-01143 and Waterway 817-4050, sold here as a convenient two-pack.

When routine filtration needs to be replaced, this AQUALTRA cartridge offers a direct, cost-effective swap for many popular spa and hot tub systems. Built from NSF-certified PET composite media, a chlorine-resistant end cap and a polypropylene core, the cartridge provides durable, BPA-free construction intended for repeated cleaning and reuse. The screw-in base uses a 2" female SAE thread and a handled top for straightforward removal and installation.

Will this cartridge fit my hot tub or spa model?

If your current filter lists dimensions of roughly 5 inches outer diameter and 13 1/16 inches length with a 2" female SAE screw-in base, this cartridge is made to match. AQUALTRA supplies compatibility information for a wide range of part numbers so you can cross-check before ordering.

• Dimensions: 5" outer diameter, 13 1/16" length
• Top: handle for easy pull-out; Bottom: 2" female SAE thread
• Common compatible part numbers: PWW50L, 4CH-949, FC-0172, SD-01143, Waterway 817-4050
• Use the part numbers shown as compatibility guides — confirm fit with your unit before purchase

How effective is this filter at capturing debris?

AQUALTRA cartridges use a layered PET composite media with a proprietary dirt-locking structure that holds more particulates than conventional pleated fabrics. This improves clarity by trapping hair, sediment, leaves and other common contaminants while still allowing good water flow.

• Filtration area: approximately 50 square feet of media
• Traps fine sediment, organic debris and visible particles
• Designed to balance filtration efficiency with low flow resistance
• Helps maintain cleaner water between routine maintenance cycles

Can I clean and reuse these cartridges?

Yes — these AQUALTRA cartridges are washable and intended for multiple cleaning cycles, which reduces replacement frequency and waste. Rinse with a garden hose or soak in a mild filter-cleaning solution, then dry before reinstalling; remove the cartridge before using chemical cleaners to avoid corrosion of any metal parts in your system.

• Material resists chlorine and stands up to repeated rinsing
• Recommended cleaning interval: every two weeks under normal use
• Avoid harsh solvents or high-pressure washers that can damage pleats
• Remove filter from the spa before chemical treatments

What should I know about safety and certification?

The filter components are made from BPA-free materials and the media is manufactured to meet NSF/ANSI material standards, providing reassurance on construction and contamination resistance. AQUALTRA emphasizes compatibility and safety but recommends confirming fit and following your spa manufacturer's maintenance guidance.

• NSF-certified filter materials and BPA-free end caps and core
• Chlorine-resistant end cap for longer service life in treated water
• Sold as an independent AQUALTRA brand replacement; manufacturer names used for compatibility only
• Follow spa manufacturer instructions for installation and maintenance

Who is this for? This two-pack is aimed at hot tub and spa owners who need a reliable, reusable screw-in replacement cartridge compatible with many commonly listed part numbers. It suits users who prefer a washable option to reduce recurring costs, homeowners maintaining clear water between professional services, and anyone who needs an easy-to-install filter with a handled top and standard 2" SAE screw base. Always verify measurements and thread type against your existing filter before buying to ensure a proper fit.