Keep your hot tub water clean, clear, and ready to enjoy with the ProAqua Rainbow 35 Sq. Ft. Replacement Filter Cartridge. Designed to capture dirt, debris, body oils, and other contaminants, this premium replacement filter helps improve water clarity while maintaining optimal performance from your spa's circulation and heating systems.
Built with durable pleated filtration media, the ProAqua 40352 provides excellent filtration efficiency and consistent water flow. Whether you're replacing a worn cartridge or maintaining a spare filter, this high-quality replacement helps extend the life of your spa equipment and ensures a healthier soaking experience.
Key Features
ā 35 square feet of filtration area
ā High-efficiency pleated filter media
ā Improves water clarity and cleanliness
ā Reduces contaminants and debris
ā Easy to clean and replace
ā OEM-quality replacement performance
ā Durable construction for extended service life
Specifications
| Specification |
Details |
| Filter Area |
35 Sq. Ft. |
| Diameter |
4-15/16" |
| Length |
9-1/4" |
| Top Opening |
2-1/8" Open |
| Bottom Opening |
2-1/8" Open |
| Filter Type |
Replacement Cartridge |
Compatible Spa Brands & Models
This filter is commonly used in select models from:
- Waterway Rainbow Dynamic Systems
- Bullfrog Spas
- Clearwater Spas
- Leisure Bay Spas
- Sun & Soul Spas
- Waterway Plastics filtration systems
- Select Sundance Spas
- Various private-label spas utilizing Rainbow Dynamic 35 filters
Always verify dimensions and end-cap style before ordering.
Cross Reference Part Numbers
This filter is compatible with and replaces:
- ProAqua 40352
- Pleatco PRB35-IN
- Unicel C-4335
- Filbur FC-2385
- Darlly 40353
- Waterway 817-3501
- Waterway 17-2482
- Waterway 25393
- Sundance 6542-177
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 the life of spa equipment
- Maintain proper water circulation
For optimal performance, rinse your filter every 2 to 4 weeks and replace it approximately every 12 months, depending on spa usage and water conditions.
Pro Tip
Keep a second filter cartridge on hand and rotate filters during cleaning. This helps maintain peak filtration performance and can extend the life of both cartridges.
