Grefilt C900 Pool Filter Cartridge 90 sq.ft — 30‑Micron Trilobal Media, Reinforced Core

The Grefilt C900 is a 90 sq.ft replacement pool filter cartridge that delivers 30-micron filtration, NSF/ANSI 50–tested materials, and extended service life for compatible Hayward, Pleatco, Unicel, Filbur and Sta-Rite systems.

Designed as a drop-in compatible replacement for common C900-style housings, this Grefilt cartridge combines a thick 5 oz trilobal filtration fabric with reinforced end caps and an integrated support core to keep pool water clearer between cleanings. The cartridge dimensions match industry-standard C900 parts — 17 3/8" length, 8 15/16" outside diameter, and 4" top and bottom openings — making it a straightforward upgrade for many residential systems.

How does this cartridge improve particle removal?

The Grefilt C900 uses a 30-micron, trilobal fiber media engineered to capture fine debris while maintaining steady flow. The trilobal structure increases surface area and improves particle entrapment without excessive pressure spikes.

• 30-micron filtration rating for finer particulate capture
• Trilobal fibers with 40% more branches for enhanced capture
• Uniform fiber distribution to reduce channeling and clogging
• Maintains flow to avoid frequent backwashing or pressure trips

Will this fit my pool filter system?

This cartridge is built to fit C900 series housings and is compatible with many major OEMs when they reference C900-class parts. Always measure your existing cartridge to confirm the 17 3/8" length, 8 15/16" diameter, and 4" openings before ordering.

• Dimensions: 17 3/8" L x 8 15/16" OD; 4" top and bottom openings
• Compatible with Hayward C900, CX900RE and similar models
• Replaces Pleatco PA90, Unicel C-8409, Filbur FC-1292, Sta-Rite PXC95
• Sold as a compatible replacement; verify fit prior to installation

How durable is the Grefilt C900 and how long will it last?

Durability is increased through a thicker 5 oz filtration fabric, robust ABS end caps, and an integrated steel-reinforced support core, which together resist deformation and prolong usable life under normal pool pressures. Grefilt estimates up to about 30% longer service life compared with standard cartridges under similar operating conditions.

• Heavy-duty 5 oz trilobal fabric for wear resistance
• High-strength ABS end caps for secure sealing and alignment
• Integrated support core to prevent collapse and maintain pleat spacing
• Reduces frequency of replacement and maintenance downtime

Is this filter safe for family pools and spas?

The cartridge media and components have been tested to NSF/ANSI 50 standards, indicating the materials are suitable for pool and spa use and do not leach harmful substances into the water. Use according to your pump and sanitizer guidelines for best results.

• NSF/ANSI 50 tested materials for pool and spa safety
• Designed to retain debris without releasing particulates back into water
• Suitable for residential family pools when installed correctly
• Follow manufacturer maintenance recommendations for safe operation

Who is this for: The Grefilt C900 cartridge is intended for residential and light-commercial pool owners looking for a direct-fit, higher-performance replacement for C900-style filters. It's a good choice if you want finer 30-micron filtration, longer intervals between cleanings, and NSF/ANSI 50–tested materials. Technicians and DIY homeowners who measure their existing cartridge and require compatibility with Hayward, Pleatco, Unicel, Filbur or Sta-Rite C900-class systems will find this cartridge an efficient upgrade.