Unicel C-4402 Replacement Filter Cartridge for Aqua Spa | 20 Sq. Ft. | 9¾"
- Low stock - 3 items left
- SKU:
- C4402
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About This Item
The Unicel C-4402 delivers 20 square feet of filtration area in a compact 9¾" spa cartridge built for Aqua Spa filter systems. Constructed with 4 oz. Reemay® 2040 spunbond polyester media across 138 precision pleats, it provides thorough debris capture and reliable flow performance. The molded cone handle top cap and slotted open bottom are engineered to seat securely in compatible Aqua Spa housings.
⚠️ Compatibility Note
This cartridge is listed as compatible with select Aqua Spa models. No specific model number or OEM part number is confirmed in the Unicel database. Always measure your existing cartridge before ordering and verify dimensions match: 20 sq. ft. | 9¾" L × 4 5/8" OD × 1 7/8" bottom ID.
Specifications
| Filter Area | 20 sq. ft. | |
| Length | 9¾" | |
| Outer Diameter | 4 5/8" | |
| Bottom Inner Diameter | 1 7/8" | |
| Top Cap | Molded cone handle (solid — no top opening) | |
| Bottom Cap | Open with slots | |
| Filter Media | 4 oz. Reemay® 2040 spunbond polyester | |
| Pleat Count | 138 | |
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Top Cap 
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Bottom Cap 
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Fits Into:
| OEM Brand | Filter Model | OEM Part # | Notes |
| Aqua Spa | Select Models | — | Verify dimensions against your existing cartridge before ordering. |
(This is not an exhaustive list.)
Pro Tip
This cartridge installs with the slotted bottom end seated over the standpipe in your filter housing — the solid molded cone handle at the top provides a secure grip for removal. Before ordering, measure your existing cartridge: length from end cap to end cap, outer diameter, and the inner diameter of the bottom opening. Dimensions should match within ⅛" for proper fit and seal.
