Description
The Unicel C-5431 is a 30 sq. ft. replacement filter cartridge precision-engineered to replace Hot Springs Spas OEM part 31233. Built with 157 pleats of 3 oz. Reemay 2033 polyester media in a compact 10 1/4″ body, this cartridge delivers consistent filtration performance and water clarity in your Hot Springs spa.
IMPORTANT: Full Filter Service Requires 5 Cartridges
Compatible Hot Springs spa models (including Grandee, Vista, Envoy, and Aria) require 5 cartridges for a complete filter service. Replacing all cartridges at the same time ensures consistent flow, balanced filtration, and full filter efficiency. Add 5 units to your cart to complete your filter service.
Specifications
| Filter Area | 30 sq. ft. |
| Length | 10 1/4″ |
| Outer Diameter | 5 1/8″ |
| Top Inner Diameter | 1 15/16″ |
| Bottom Inner Diameter | 1 15/16″ |
| Material | 3 oz. Reemay 2033 |
| Pleat Count | 157 |
| Top Cap: Open | Bottom Cap: Open |
Fits into:
| OEM Brand | Product Name | Part Number | Notes |
| Hot Springs Spas | 31233 | Requires 5 cartridges for complete filter service |
(This is not an exhaustive list.)
Pro Tip: Before ordering, confirm the fit by measuring your existing cartridge: 10 1/4″ length (end cap to end cap), 5 1/8″ outer diameter, and 1 15/16″ inner diameter on both ends. Verify against Hot Springs Spas OEM part number 31233 on your original cartridge or in your owner’s manual.
Also known as: C5431
