C900 Pool Filter Replacement for Hayward CX900RE - Precise Fit

In this review of the C900 Pool Filter Replacement, the bottom line is simple: this cartridge is for pool and spa owners who need a precise, easy-to-maintain swap for Hayward CX900RE-style housings. The reviewer found it delivers on a close, leak-free fit and predictable filtration performance, making it a solid practical choice. Tested by IAPMO to meet NSF/ANSI 50 standards, the filter removes larger visible debris and helps keep pumps from clogging while offering a linens-like balance of filtration and rinseability.

Key Features

• Precision Fit: Exact 17 3/8' length and 8 15/16' diameter with 4' openings ensures a snug replacement for Hayward CX900RE and related housings without modification.
• Wide Compatibility: Designed to work with many models including PA90, Unicel C-8409, and Sta-Rite PXC-95 so buyers can replace multiple legacy cartridges with one part number.
• NSF/ANSI 50 Certified: Independently tested by IAPMO to capture 50-micron particles, which helps remove hair, sand, and larger debris from pool water.
• Advanced Trilobal Fabric: The trilobal weave provides about 30% more surface area versus flat polyester, improving debris capture while reducing backpressure on the pump.
• Low-Maintenance Design: Easy-rinse construction lets owners clean the cartridge monthly and typically get 5-8 reuse cycles before replacement, lowering operating cost.

Who It's For

This replacement cartridge is ideal for residential pool and spa owners who run Hayward CX900RE-style filters or the many compatible models listed, and who prefer a reusable, easy-rinse element rather than disposable pleated paper. It suits people who value a precise mechanical fit and want to avoid custom modifications or adapters.

It is less appropriate for operators seeking sub-micron filtration for commercial or medical applications; the cartridge is certified to remove particles down to about 50 microns, so those needing finer clarity should consider different media or additional treatment methods.

Pros & Cons

Pros

• Good fit and compatibility with many legacy filter housings, avoiding installation hassles.
• Easy to clean with the recommended monthly rinse, which customers consistently mention as a practical benefit.
• Trilobal fabric increases surface area and reduces pump backpressure compared with flat polyester designs.

Cons

• Rated to 50 microns, it does not capture the finest particulate matter, so it will not replace fine cartridge or diatomaceous earth filtration for extreme clarity.

Specifications

Length	17 3/8 in
Diameter	8 15/16 in
Opening Size	4 in
Compatible Models	Hayward CX900RE, C900, PA90, Unicel C-8409, Sta-Rite PXC-95, Aladdin 19002
Certification	NSF/ANSI 50 (IAPMO tested)
Material	Advanced trilobal fabric
Reuse Cycles	5-8 rinse cycles recommended

Our Verdict

The C900 Pool Filter Replacement is a practical, cost-effective choice for homeowners with CX900RE-style housings who want a reliable, easy-to-clean cartridge. It offers a precise mechanical fit, proven filtration to 50 microns, and the benefits of trilobal fabric for longer service between cleanings, making it good value for routine residential pool maintenance.

Frequently Asked Questions

Will this cartridge fit my Hayward CX900RE filter?
Yes; the cartridge is designed to be a seamless replacement with exact 17 3/8' length and 8 15/16' diameter and 4' openings for CX900RE-style housings.

How often should the filter be cleaned?
Monthly rinsing is recommended and each cartridge typically supports about 5-8 reuse cycles before replacement.

What size particles does it remove?
It is IAPMO tested to NSF/ANSI 50 and removes particles down to about 50 microns such as hair, sand, and larger debris.