Unicel C-7470-4 Cartridge Filter Set – 4 Pack, 80 Sq Ft Each (Fits Pentair Clean & Clear Plus 320 / Waterway Crystal Water 325)
The Unicel C-7470-4 is a complete set of four replacement cartridge elements designed for multi-cartridge pool filters that use four matching cartridges. Each cartridge provides 80 sq ft of filtration area (for a combined 320 sq ft when installed as a full set), helping deliver clear water, strong circulation, and longer time between cleanings compared to smaller filter systems.
Key Features
- 4-pack set for multi-element cartridge filter tanks (replaces all cartridges at once)
- 80 sq ft per cartridge (320 sq ft total system area when using all four)
- Open top & open bottom design for standpipe-style canisters
- 3″ inside diameter openings on both ends for proper fit on compatible standpipes
- Durable pleated media for strong debris capture and consistent flow when cleaned regularly
Specifications (Each Cartridge)
- Model: C-7470 (set: C-7470-4)
- Filtration Area: 80 sq ft
- Outside Diameter: 7″
- Length: 20″
- Top End Cap: Open
- Top Inside Diameter: 3″
- Bottom End Cap: Open
- Bottom Inside Diameter: 3″
- Pleat Count: 170
Compatible Filter Applications
- Pentair / Pac-Fab: Clean & Clear Plus 320 (CCP320) – uses (4) cartridges
- Waterway: Crystal Water 325 sq ft – uses (4) cartridges
Replaces / Cross References
- Pentair: R173573
- Pac-Fab / Pentair: 178580
- Pleatco: PCC80
- Filbur: FC-1976 (and equivalent cross-references)
- Waterway: 817-0081
When to Replace
- Pleats are torn, frayed, or separating from the end caps
- Cartridges won’t clean up well after a deep soak and thorough rinse
- Filter pressure rises quickly after cleaning or flow remains restricted
- End caps are cracked/warped or the core is collapsing
Related Products
- Unicel C-7470 (Single Cartridge)
- Pentair Clean & Clear Plus 320 Tank O-Rings & Gaskets
- Cartridge Filter Cleaner
- Cartridge Cleaning Wands
- Filter Pressure Gauges
- Silicone Pool Lube (for O-rings)
Maintenance Tips
- Clean cartridges when pressure rises about 8–10 PSI above your clean starting pressure (or when flow drops).
- Rinse between pleats from top to bottom and rotate the cartridge as you clean for a more thorough rinse.
- Deep clean periodically to remove oils; if scale is present, degrease first, then treat for scale and rinse thoroughly.
- Inspect and lightly lubricate tank O-rings during service to help maintain a consistent seal and prevent air leaks.
