AQUALTRA PDM28 Spa Filter Replacement 28 sq.ft. 2 Pack - Durable, NSF

In this review the AQUALTRA PDM28 spa filter replacement is evaluated for spa owners who need a reliable, easy-to-maintain cartridge. The bottom line: this two-pack is best for people with compatible hot tubs seeking a washable, NSF certified cartridge that balances filtration performance and value. The review focuses on build quality, compatibility with common PDM28/461273/FC-9944 style cartridges, and how the filter performs during routine maintenance and regular use.

Key Features

• NSF Certified Material: Constructed from PET composite, polypropylene core, and chlorine-resistant end caps to provide safe, BPA-free filtration for regular spa use.
• Exact Compatibility: Sized with a 5 1/2in outer diameter and 7 1/4in length with three openings top and bottom to fit PDM28, 461273, FC-9944 and related cartridges.
• Large Filtration Area: The 28 sq.ft. media provides substantial surface area to capture hair, dust, sediment and leaves before they recirculate in the spa.
• Dirt-Locking Technology: The woven fabric is designed to trap finer particles more effectively than ordinary cartridge media, helping keep water clearer between cleanings.
• Washable and Reusable: Durable fabric and construction let you rinse and reuse the cartridge; regular biweekly cleaning maintains performance and extends life.
• Customer Support: The brand promises responsive assistance for issues, aiming to resolve concerns within 24 hours for peace of mind after purchase.

Who It's For

The AQUALTRA PDM28 is aimed at hot tub and spa owners with compatible filter housings that accept a 5 1/2in x 7 1/4in cartridge with three openings top and bottom, especially those who prefer washable filters over one-time disposables. It suits people who swim frequently and want a cartridge that reduces visible debris and helps maintain clearer water between chemical treatments.

Those who should look elsewhere include owners with nonstandard filter dimensions or uncommon connector types, and users who prefer ultra-fine cartridge technology used in some premium brands. Also, if you require a filter with very specific OEM branding, note this is an independent replacement brand provided for compatibility rather than an OEM part.

Pros & Cons

Pros

• NSF certified, BPA-free materials that resist chlorine and are built for regular spa exposure.
• Large 28 sq.ft. filtration area and dirt-locking fabric that capture a variety of contaminants effectively.
• Washable, reusable design simplifies maintenance and reduces replacement frequency when cleaned every two weeks.
• Clear compatibility information for common PDM28-style cartridges makes it easy to confirm fit.

Cons

• Not an OEM part, so buyers must confirm fit carefully against their spa model and dimensions.
• Requires routine manual cleaning; performance depends on consistent maintenance.

Specifications

Brand	AQUALTRA
Model compatibility	PDM28, 461273, FC-9944, SD-01392, 2015 newer Aquarest Spas
Filtration area	28 sq.ft.
Outer diameter	5 1/2 in
Length	7 1/4 in
Top / Bottom openings	3 openings top, 3 openings bottom
Materials	PET composite media, polypropylene core, chlorine-resistant end cap (BPA-free)

Our Verdict

The AQUALTRA PDM28 replacement is a practical choice for owners of compatible hot tubs who want a durable, NSF certified cartridge that balances performance and cost. Its reusable construction and dirt-locking fabric deliver noticeably cleaner water when cleaned on a regular schedule, making it a good value for routine spa maintenance while requiring users to confirm fit before purchase.

Frequently Asked Questions

Will this filter fit my spa?
Check that your current cartridge measures approximately 5 1/2in outer diameter and 7 1/4in length with three openings top and bottom; the listing is intended for PDM28/461273/FC-9944 style cartridges.

How often should I clean the cartridge?
It is recommended to rinse and clean the filter about every two weeks for typical use to maintain flow and filtration performance.

Is this an OEM part?
No, AQUALTRA is an independent replacement brand; manufacturer names and part numbers are used for compatibility information only.