Grefilt C150S Pool & Spa Cartridge Filter 150 sq. ft. — 30‑Micron, Heavy‑Duty Trilobal Fabric

The Grefilt C150S is a 150 sq. ft. replacement pool and spa cartridge filter built to deliver finer 30-micron filtration, extended service life, and NSF/ANSI 50–certified materials for safe family water.

Designed as a durable compatible replacement for popular cartridge models, the Grefilt C150S fits many Hayward SwimClear C150S variants and equivalent cartridges from Pleatco, Unicel, Spa‑Daddy, and others. It pairs heavy-duty trilobal filtration fabric with reinforced end caps and an integrated support core so the filter resists collapse, traps finer particles, and maintains stable flow through longer cleaning cycles.

How well does the Grefilt C150S remove debris and fine particles?

This cartridge is engineered for 30-micron nominal filtration using a multi-branch trilobal fiber that increases surface area and particle capture. The fabric’s uniform distribution reduces bypass and helps keep water clearer between cleanings without excessive pressure buildup.

• 30-micron precision rating for finer particle capture
• Trilobal fibers with 40% more branching to boost surface area
• 150 square feet of total filtration area for higher dirt-holding capacity
• Maintains stable flow to avoid frequent backwashing or cleaning

Will the Grefilt C150S fit my existing filter housing?

Measure your current cartridge before ordering. The Grefilt C150S matches common replacement dimensions used by many pool brands, but confirming size ensures a proper seal and performance. It is intended as a compatible replacement, not an original manufacturer part.

• Overall length: 23 1/8" (measure to match your unit)
• Outside diameter: 10 1/8" for most standard housings
• Top and bottom opening: 4" center cores for secure fit
• Cross‑references: fits many Hayward SwimClear C150S styles and equivalents (Pleatco PA150S, Unicel C-9441, Spa‑Daddy SD‑01333, etc.)

How durable is this cartridge and what construction features extend its life?

The C150S uses thickened 5 oz trilobal fabric, sturdy ABS end caps, and an integrated support core to resist distortion under pressure and reduce failure risk. Those reinforcements provide longer service intervals, fewer replacements, and dependable performance in heavy-use pool and spa environments.

• 5 oz heavy-duty trilobal filtration fabric resists tearing and compression
• High-strength ABS end caps improve sealing and stability
• Internal support core prevents collapse under high flow or vacuum
• Manufacturer testing indicates up to ~30% longer usable life versus standard cartridges

Is the Grefilt C150S safe for family pools and spas?

The cartridge is manufactured from materials tested to NSF/ANSI 50 standards for pool and spa components, which helps ensure the filter media and parts do not leach harmful substances into the water. Certification supports safe use in household and commercial aquatic settings when installed and maintained correctly.

• NSF/ANSI 50 certified materials for pool and spa safety
• Designed to trap contaminants while avoiding harmful material transfer
• Follow regular cleaning and replacement intervals to maintain safety and efficiency

Who this is for: Pool and spa owners who need a direct-fit, high-capacity replacement cartridge that balances finer 30-micron filtration with reinforced construction. Ideal for residential pools, family spas, and light commercial settings that use Hayward SwimClear-style cartridge housings or equivalent models from Pleatco, Unicel, and Spa‑Daddy. Verify the cartridge dimensions—23 1/8" length, 10 1/8" OD, 4" port openings—against your current filter before purchasing to ensure compatibility.