Keep your spa water clean, clear, and inviting with the ProAqua 35 Sq. Ft. Replacement Filter Cartridge. Designed to efficiently capture dirt, debris, oils, and other contaminants, this premium filter helps maintain optimal water quality while supporting the performance of your spa's circulation and heating systems.
Manufactured with durable pleated filtration media, this replacement cartridge provides reliable filtration performance and excellent water flow. Whether you're replacing an existing filter or stocking up on maintenance essentials, the ProAqua 40353 is a dependable solution for many popular hot tub brands.
Key Features
✔ 35 square feet of filtration area
✔ High-quality pleated filtration media
✔ Helps maintain crystal-clear water
✔ Improves circulation and filtration efficiency
✔ Easy to remove, clean, and replace
✔ Durable construction for extended service life
✔ OEM-quality replacement performance
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 |
| Media Weight |
3 oz. |
| Filter Type |
Replacement Cartridge |
Compatible Spa Brands & Models
This filter is commonly used in:
- Waterway Rainbow Dynamic 35 Systems
- Bullfrog Spas
- Clearwater Spas
- Leisure Bay Spas
- Sun & Soul Spas
This filter may also fit additional models using a 35 sq. ft. cartridge with matching dimensions and end-cap configuration.
Always compare dimensions and filter end styles before ordering.
Cross Reference Part Numbers
This filter is commonly referenced as:
- ProAqua 40353
- 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
- Reduce buildup of contaminants
- Increase filtration efficiency
- Extend the life of pumps and heaters
- Improve sanitizer effectiveness
- Maintain proper water flow
For best results, rinse your filter every 2 to 4 weeks and replace it every 12 months, or as recommended by your spa manufacturer.
Pro Tip
Keeping a spare filter allows you to rotate cartridges during cleaning. This helps maintain proper filtration, reduces downtime, and can extend the life of your filters.
