Keep your hot tub water sparkling clean with the ProAqua 35 Sq. Ft. Waterway Replacement Filter Cartridge. Designed to effectively trap dirt, debris, body oils, and other contaminants, this high-performance filter helps maintain crystal-clear water while protecting your spa's pump, heater, and circulation system.
Manufactured with durable pleated filter media, the 4CH-935 delivers excellent filtration efficiency and dependable water flow. Whether you're replacing an old filter or keeping a spare on hand, this cartridge provides reliable OEM-quality performance for many Waterway and compatible spa systems.
Key Features
ā 35 square feet of filtration area
ā Premium pleated filtration media
ā Improves water clarity and cleanliness
ā Promotes efficient water flow
ā Easy to clean and maintain
ā OEM-quality replacement performance
ā Durable construction for long service life
Specifications
| Specification |
Details |
| Filter Area |
35 Sq. Ft. |
| Filter Type |
Replacement Cartridge |
| Top Style |
Open |
| Bottom Style |
Open |
| Application |
Hot Tubs & Spas |
Please verify all dimensions before ordering to ensure proper fitment.
Compatible Spa Brands & Models
This filter is commonly used in select models from:
- Waterway Plastics
- Rainbow Dynamic Filtration Systems
- Bullfrog Spas
- Clearwater Spas
- Leisure Bay Spas
- Sun & Soul Spas
- Select private-label and custom-manufactured hot tubs using Waterway filtration systems
Always compare filter dimensions, filter area, and end-cap style with your existing cartridge before purchasing.
Cross Reference Part Numbers
This filter may also be referenced as:
- ProAqua 40355
- 4CH-935
- 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:
- Maintain cleaner, clearer water
- Improve filtration performance
- Reduce wear on pumps and heaters
- Increase sanitizer efficiency
- Improve water circulation
- Extend the life of spa equipment
For optimal performance, rinse your filter every 2 to 4 weeks and replace it every 12 months, or according to your spa manufacturer's recommendations.
Pro Tip
Keeping a spare filter cartridge allows you to rotate filters during cleaning cycles, reducing spa downtime and helping each filter last longer.
