Keep your hot tub water crystal clear with the ProAqua C-4975 Replacement Filter Cartridge, a premium 75 sq. ft. filter designed to deliver exceptional water clarity and filtration performance. Built to remove dirt, body oils, debris, and other contaminants, this replacement cartridge helps maintain healthier spa water while reducing strain on your spa's pump, heater, and circulation system.
Featuring durable pleated filtration media and OEM-quality construction, the C-4975 provides excellent flow rates and superior dirt-holding capacity. Its extended filter surface area allows for efficient filtration and longer intervals between cleanings, making it a popular choice for high-demand spa systems.
Key Features
✔ 75 square feet of filtration area
✔ Premium pleated filtration media
✔ Captures dirt, debris, oils, and contaminants
✔ Improves water clarity and filtration efficiency
✔ High dirt-holding capacity
✔ OEM-quality replacement performance
✔ Easy installation and maintenance
✔ Durable construction for long service life
Specifications
| Specification |
Details |
| Filter Area |
75 Sq. Ft. |
| Diameter |
4-15/16" |
| Length |
19-1/8" |
| Top Opening |
2-1/8" Open |
| Bottom Opening |
2-1/8" Open |
| Filter Type |
Replacement Cartridge |
Always verify dimensions and end-cap style before ordering.
Compatible Spa Brands & Models
This filter is commonly used in:
Rainbow Dynamic Systems
- Rainbow RTL-75
- Rainbow Dynamic 75 filtration systems
CMP Filtration Systems
- CMP 75 Sq. Ft. systems
- CMP top-load filter assemblies
Compatible Spa Brands
- Bullfrog Spas
- Coast Spas
- Clearwater Spas
- Leisure Bay Spas
- Viking Spas
- PDC Spas
- Beachcomber (select models)
- Hydropool (select models)
- Waterway filtration systems
- Various private-label spa manufacturers utilizing RTL-75 style filters
Always compare your existing cartridge measurements before placing an order.
Cross Reference Part Numbers
This filter is compatible with and replaces:
- ProAqua 40751
- Unicel C-4975
- Pleatco PRB75-IN
- Filbur FC-2395
- Darlly 40751
- Rainbow RTL-75
- CMP RTL-75
- Waterway 817-0075
- Waterway 817-0750
- Aladdin 17502
- APCC7075
Why Replace Your Hot Tub Filter?
Regular filter replacement helps:
- Improve water clarity
- Increase filtration efficiency
- Reduce strain on pumps and heaters
- Improve sanitizer effectiveness
- Extend spa equipment life
- Maintain proper water circulation
For best results, rinse your filter every 2 to 4 weeks and perform a deep cleaning every 3 to 4 months. Replace annually, or sooner depending on spa usage and water conditions.
Pro Tip
Keep a spare filter cartridge on hand and rotate filters during cleaning. This helps maintain maximum filtration performance while extending the lifespan of both cartridges.
