POOLPURE Replacement Filter for PMAX50P4 Unicel 5CH-35 - Reliable

In this review the POOLPURE replacement filter is evaluated for small-to-medium pool and spa systems that accept 1 1/2' MPT cartridges. The bottom line: this two-pack delivers strong filtration performance and certified safety at a budget-friendly price, making it a sensible choice for owners who want clear water without paying dealer prices. The review highlights build quality, fit, and cleaning behavior so you can decide whether this compatible cartridge meets your maintenance routine.

Key Features

• NSF/ANSI 50 certified: gives reassurance the cartridge has been independently tested for safety and basic performance so users can trust water quality results.
• Trilobal Filtration Fabric: the specialized fabric holds more debris and releases it more easily during cleaning, reducing the time needed for maintenance.
• Dirt-Locking technology: traps hair, leaves, sand and sediment more effectively than generic fabrics for clearer water between cleanings.
• Convenient dimensions: at 8 in length with a 5 3/4 in outside diameter, it fits a range of compatible housings designed for this size.
• 1 1/2' MPT base: the threaded bottom connection is standard for many filter tanks, making installation straightforward when the fit is correct.
• Two-pack value: sold as a pair, it is practical for staggered replacements and saves a trip to buy one at a time.

Who It's For

This cartridge is best for homeowners or service technicians who need a certified, cost-effective replacement for PMAX50P4-style systems and compatible models such as Unicel 5CH-35, Filbur FC-0300, Excel XLS-526 and similar cartridges. It suits pools and spas that require a compact 8 in cartridge with a 1 1/2' MPT connection and who perform regular monthly cleanings to maintain flow.

Those who should look elsewhere include owners who require the original manufacturer's branded part for warranty reasons or systems with nonstandard connectors. Also, customers worried about long-term mechanical durability of connection pieces may prefer purchasing from a brand that guarantees the exact OEM molded fittings.

Pros & Cons

Pros

• Certified NSF/ANSI 50 testing provides verified safety and filtration credibility.
• Trilobal fabric and Dirt-Locking structure offer strong filtration capacity and easier cleaning.
• Dimensioned to replace several common models and sold as a convenient two-pack for value.
• Customers report good filter quality and larger material volume than some competing cartridges.

Cons

• Fit is mixed across users; a few report connection pieces breaking or the bottom coming unglued after weeks of use.
• Not designed for backwashing, so systems that rely on backwashable cartridges are incompatible.

Specifications

Our Verdict

The POOLPURE replacement cartridge is a practical, value-oriented choice for anyone running a compatible 8 in, 1 1/2' MPT pool or spa filter who wants certified filtration and easier cleaning. It delivers strong dirt-holding capacity and reliable water clarity for routine maintenance cycles, though a few users reported fit or durability issues around the molded connection, so buyers should inspect fittings after installation.

Frequently Asked Questions

Is this an exact OEM part?
This is a compatible replacement; original manufacturer names are listed for reference and POOLPURE is an independent brand.

How often should the cartridges be cleaned?
Monthly cleaning is recommended for optimal performance given the Trilobal fabric's ability to release trapped impurities.

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