Keep your hot tub water crystal clear with the ProAqua 5CH-502 Replacement Filter Cartridge. Designed for select Marquis Spas®, Cal Spas®, and compatible hot tubs, this premium 50 sq. ft. filter captures dirt, body oils, debris, and other contaminants to help maintain clean water and optimal spa performance.
Constructed with high-quality pleated filtration media, the 5CH-502 delivers excellent water flow while trapping fine particles that can affect water clarity and equipment efficiency. Its durable design and OEM-compatible fit make it an ideal replacement for routine spa maintenance.
Key Features
✔ 50 square feet of filtration area
✔ Premium pleated filtration media
✔ Improves water clarity and cleanliness
✔ Captures dirt, oils, and debris
✔ OEM-quality replacement performance
✔ Easy installation and removal
✔ Durable construction for long filter life
✔ Designed for Marquis and Cal Spa filtration systems
Specifications
| Specification |
Details |
| Filter Area |
50 Sq. Ft. |
| Diameter |
5-3/16" |
| Length |
12-1/2" |
| Top Style |
Bar Handle |
| Bottom Style |
2" Male Thread (MPT) |
| Pleat Count |
Approximately 197 |
| Filter Type |
Replacement Cartridge |
Compatible Spa Brands & Models
This filter is commonly used in:
Marquis Spas®
- Marquis Spa 20041
- Marquis Spa 20091
- Marquis Spa 370-0237
- Select Marquis E-Series Models
- Select Marquis Signature Series Models
Cal Spas®
- Select Cal Spa filtration systems utilizing the 5CH-502 cartridge
- Select Cal Spas low-flow circulation filter systems
Additional Compatible Applications
- Pacific Marquis Spas
- PDC Spas (select applications)
- Other hot tubs using the 5CH-502 / PPM50SC-F2M filter configuration
Always verify your filter measurements and thread style before ordering.
Cross Reference Part Numbers
This filter is compatible with and replaces:
- ProAqua 50501
- Unicel 5CH-502
- Unicel C-5303
- Pleatco PPM50SC-F2M
- Filbur FC-0195
- Marquis 20041
- Marquis 20091
- Marquis 370-0237
- OEM FIL11100202
- Baleen AK-90106
- Magnum MA50
- PDC30-AFS
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 the filter annually or as recommended by your spa manufacturer.
Pro Tip
Rotate between two filter cartridges during routine maintenance. Allowing a freshly cleaned filter to dry completely before reuse can help extend filter life and improve filtration performance.
