Unicel 4CH-950 | 25 Sq. Ft. Replacement Filter Cartridge | 12" with SAE Thread
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- SKU:
- 4CH-950
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About This Item
Unicel 4000 Series 25 Sq. Ft. Replacement Filter Cartridge
The Unicel 4CH-950 is a precision-engineered replacement filter cartridge delivering 25 square feet of filtration area in a compact 12" profile. Built with 139 pleats of 3 oz. Reemay 2033 spun-bond polyester media, it captures fine particulates while sustaining strong flow rates — purpose-built for demanding spa filtration applications. The closed top with semi-circular handle makes removal clean and straightforward; the 1-1/4" SAE-threaded bottom seats securely for leak-free performance.
⚠️ IMPORTANT: Dimension One Vision® Sanitizing System — Two-Filter Setup
The Dimension One Vision® Sanitizing System uses two separate filters: this inner cartridge (OEM #1561-04) plus a larger outer filter sold separately. Purchasing only this cartridge will not complete a full filter service. Confirm your spa's filter configuration in your owner's manual before ordering.
Specifications
| Filter Area | 25 sq. ft. |
| Length | 12" |
| Outer Diameter | 4 5/8" |
| Top Inner Diameter | N/A |
| Bottom Inner Diameter | N/A |
| Material | 3 oz. Reemay 2033 |
| Pleat Count | 139 |
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Top Cap: semi-circular handle
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Bottom Cap: 1-1/4" SAE thread
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Fits Into:
| OEM Brand | Product Name | Part Number | Notes |
| Dimension One Spas | 25 sq. ft. Top Load | 1561-04 | Replacement for Dimension One Spas. Inner filter — system also requires a separate outer filter. |
| Saratoga Spas | — | 74408-99 | — |
(This is not an exhaustive list.)
Pro Tip: The 1-1/4" SAE thread is a fine thread standard — it is not interchangeable with standard MPT (male pipe thread) fittings. Always match your existing cartridge's thread type, length, and outer diameter before ordering.
