AQUALTRA Hot Tub Filter Cartridge PDM28 2-Pack — 28 sq.ft., 5.5 x 7.25 in, NSF PET Media

AQUALTRA PDM28 is a drop-in hot tub filter cartridge (28 sq.ft., 5½" x 7¼") designed to replace Dream Maker 461273, FC-9944, SD-01392 and similar models, sold here as a convenient two-pack.

If you own a compatible hot tub or spa, keeping water clear and pumps running efficiently depends on timely filter replacement. These AQUALTRA cartridges are constructed from NSF-certified PET composite media with chlorine-resistant end caps and a polypropylene core, giving you a BPA-free option that fits common PDM28-style housings. The pack includes two identical filters sized for a 3" top and bottom opening and a 28 square-foot filtration area, intended for easy swap-in replacement and regular cleaning.

How does this filter improve water clarity?

The cartridge captures solids that would otherwise cloud your spa, from hair and skin cells to leaves and sand. Its layered PET composite fabric and "dirt-locking" design increase contaminant retention compared with basic paper-style cartridges, helping the circulation system run cleaner between cleanings.

• 28 sq.ft. filtration surface for more debris capture
• Multi-layer PET media with enhanced dirt-locking action
• Fits standard PDM28-type housings to maintain pump efficiency

Will this fit my hot tub or spa model?

Measure your existing cartridge to confirm compatibility: 5½" outer diameter, 7¼" length, and 3" openings at top and bottom. AQUALTRA lists compatibility with PDM28, Dream Maker 461273, FC-9944 (FC9944), SD-01392 and many 2015-or-newer Aquarest spa models, but matching dimensions is the most reliable method.

• Outer diameter: 5.5 inches; length: 7.25 inches
• Top and bottom openings: 3 inches each
• Compatible with commonly referenced part numbers (used for reference only)

How do I clean and maintain these cartridges?

These filters are washable and reusable: rinse debris with a garden hose and occasionally use a filter-cleaning solution or soak for deeper cleaning. Remove the filter before scrubbing or using chemicals to avoid corrosion of other spa components, and follow a two-week cleaning cadence for regular use.

• Rinse with a hose after each heavy use
• Soak in filter cleaner monthly or as needed
• Remove filter before any chemical shock treatments

What materials and safety standards does it meet?

The cartridge uses BPA-free components, including a polypropylene core and chlorine-resistant end caps, and the filtration media is NSF/ANSI certified to provide a safer material profile. These construction details reduce the risk of premature degradation and help maintain consistent performance in chlorinated spa water.

• NSF/ANSI-certified PET composite media
• Chlorine-resistant end caps for longer life
• BPA-free construction throughout the cartridge

Who is this for? This two-pack of AQUALTRA PDM28 replacement cartridges is intended for hot tub and spa owners who need a drop-in, reusable filter that matches PDM28-size housings. It’s well suited to people who perform regular maintenance, want NSF-certified materials, and prefer a cost-effective, washable alternative to one-time-use filters. Confirm dimensions and part-fitment before purchase to ensure proper compatibility with your spa model.