6CH-940 Spa Filter Compatible PWW50P3 FC-0359 2-Pack - 45 sq.ft

Our review of the 6CH-940 spa filter compatible 2-pack finds it best for hot tub owners who need a reliable, easy-to-install replacement that matches popular OEM dimensions. The bottom line: this GREFILT-compatible set delivers a precise physical fit and a large 45 sq.ft. filtration area, so it removes debris effectively while remaining simple to maintain. It is not an OEM part but is NSF certified for safe filter materials, which makes it a practical choice for households prioritizing clean spa water without a complicated installation process.

Key Features

• Precise fit: Designed to replace Pleatco PWW50P3, Unicel 6CH-940 and listed models, the filter matches the listed dimensions so replacement is straightforward.
• Generous filtration area: With 45 sq.ft. of media, the cartridge captures a significant amount of fine debris before cleaning is required.
• Durable construction: Corrosion-resistant end caps and reinforced polyester fiber help the cartridge withstand repeated cleaning and spa conditions.
• NSF certified materials: The filter media meets US safety standards for pool and spa materials, providing reassurance about water purity.
• Tool-free maintenance: The top circular handle and common 1 1/2' SAE bottom thread allow simple removal and reinstallation without special tools.
• Value pack: Sold as a 2-pack, it supplies an immediate spare so owners can rotate cartridges during cleaning cycles.

Who It's For

This cartridge set is aimed at hot tub and spa owners who already use models compatible with Pleatco PWW50P3, Unicel 6CH-940 or Filbur FC-0359 and who value an affordable, NSF certified aftermarket replacement. It suits DIY maintainers who prefer simple, tool-free swaps and regular cleaning every couple of weeks.

Those who should look elsewhere include owners of unrelated filter models or spas requiring proprietary OEM-only parts; this compatible product is engineered to match the listed models only and will not fit other designs. Also, buyers seeking a factory-branded original may prefer to source an OEM cartridge instead.

Pros & Cons

Pros

• Accurate dimensions and thread type make installation predictable and reduce the chance of fit issues.
• NSF certified filter materials offer confidence in water safety when used as directed.
• Durable materials and reinforced fiber increase longevity through multiple cleaning cycles.

Cons

• As a compatible spare part, it is not an OEM branded cartridge, which may concern buyers seeking exact manufacturer provenance.
• Limited to the specific compatible models listed and will not fit other filter designs.

Specifications

Length	8 1/8 in
Outside Diameter	6 in
Filtration Area	45 sq.ft.
Bottom Thread	1 1/2 in SAE Thread
Top	Circular Handle
Core	PP Core
Package Quantity	2 Filters

Our Verdict

The GREFILT 6CH-940 compatible 2-pack is a sensible value for owners of the listed spa models who want a durable, NSF certified replacement that installs easily and provides a large 45 sq.ft. filtration area. It is a practical, cost-effective alternative to OEM cartridges when you need reliable filtration and straightforward maintenance.

Frequently Asked Questions

Will these filters fit my spa?
They fit spas that accept Pleatco PWW50P3, Unicel 6CH-940, Filbur FC-0359 and the other listed models; measure length and diameter to confirm compatibility.

How often should these be cleaned?
Routine cleaning every two weeks is recommended for optimal performance, with replacement based on condition and usage.

Are these original manufacturer parts?
No, these are compatible spare parts from GREFILT; manufacturer names and part numbers are used for reference only.