POOLPURE PDM28 Spa Filter Replaces Aquarest 461273 - Deep Clean

In this review the POOLPURE PDM28 spa filter is evaluated as a direct replacement option for owners needing a reliable cartridge rated at 28 sq. ft. The bottom line: this cartridge is for hot tub and spa owners who want a certified, precision 50 micron replacement that fits PDM28 and 461273 housings and delivers clear water without high maintenance. The reviewer found the trilobal filtration fabric effective at trapping hair, sand, and fine sediment while remaining easy to rinse and handle.

Key Features

• Dimensions: The 7 1/4 in length and 5 1/2 in outer diameter provide a snug fit for compatible housings, reducing bypass and improving filtration efficiency.
• Filtration Area: With 28 sq. ft of surface area the cartridge offers extended dirt-holding capacity so pumps run cleaner between maintenance cycles.
• Material: Trilobal filtration fabric increases surface area and optimizes back pressure for consistent circulation and clear water.
• Certifications: IAPMO tested to NSF/ANSI 50 means the materials meet safety standards and the 50 micron precision removes fine particles like dust and sand.
• Maintenance: The uniform fabric releases trapped debris during rinsing, simplifying monthly cleaning and reducing time spent on upkeep.
• Compatibility Note: Marketed as a compatible replacement for PDM28 and 461273 models, making it straightforward to source a substitute cartridge.

Who It's For

This filter is best for spa and hot tub owners who need a direct-fit replacement cartridge and value certified materials and a well engineered pleated fabric. It suits people who perform monthly cleaning and want improved removal of hair, leaves, and fine sediment without modifying the filtration system.

It is less suitable for users who expect factory-original labeling or guaranteed fit across every brand; several customers reported fit issues with some Aquarest systems, so double-check dimensions before ordering if your housing differs from the listed sizes.

Pros & Cons

Pros

• Effective filtration from trilobal fabric that traps fine particles and keeps water clearer between cleans.
• NSF/ANSI 50 certification gives confidence in material safety and 50 micron precision.
• Simple monthly maintenance: fabric releases debris easily when rinsed.
• Clear compatibility callouts for PDM28 and 461273 make selection straightforward for many owners.

Cons

• Mixed reports on build quality and occasional compatibility problems with some Aquarest tubs suggest verifying fit ahead of time.
• Not designed for backwashing; attempting to backwash may damage the cartridge.

Specifications

Our Verdict

The POOLPURE PDM28 cartridge is a practical, value-focused replacement for spa owners who need a certified 28 sq. ft cartridge that removes fine particles and keeps circulation stable. Buyers who confirm the listed dimensions and compatible model numbers will get good performance and easier monthly maintenance, though those seeking guaranteed original-brand labeling should consider that this is an independent compatible part.

Frequently Asked Questions

Will this fit my spa?
Check that your current cartridge measures about 7 1/4 in by 5 1/2 in with 3 in top and bottom openings and that your model is PDM28 or 461273 for best compatibility.

How often should it be cleaned?
Monthly cleaning is recommended depending on usage to maintain peak performance and low back pressure.

Can this cartridge be backwashed?
No. The cartridge is not designed for backwashing and doing so may cause cracks or permanent damage.