Unicel C-4325 Replacement Filter Cartridge for Hayward MicroStar-Clear C225 & Pentair Commander II | 25 Sq. Ft. | 11 7/8"
- In stock, ready to ship
- SKU:
- C-4325
-
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About This Item
The Unicel C-4325 is a 4000 Series 25 sq. ft. replacement filter cartridge engineered for the Hayward MicroStar-Clear C225 and Pentair-American Products Commander II in-line pool filter systems. Featuring 138 pleats of 3 oz. Reemay® 2033 spunbond polyester media, this cartridge delivers the filtration surface area and dimensional precision needed to keep your water clear and your system running at rated capacity.
⚠️ IMPORTANT: FITMENT NOTE — OEM DIMENSION VARIANCE
The original Hayward MicroStar-Clear C225 cartridge measures 4-3/4" OD and 11-13/16" overall length. The original American Products Commander II cartridge measures 4-11/16" OD. The Unicel C-4325 is engineered at 4 5/8" OD — a precision replacement dimension designed to seat and seal correctly within both filter housings. If you are measuring your old cartridge, these small OD differences are expected and normal for a Unicel replacement.
Specifications
| Filter Area | 25 sq. ft. |
| Length | 11 7/8" |
| Outer Diameter | 4 5/8" |
| Top Inner Diameter | 2 1/16" |
| Bottom Inner Diameter | 2 1/16" |
| Material | 3 oz. Reemay® 2033 |
| Pleat Count | 138 |
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Top Cap: Open
|
Bottom Cap: Open
|
Fits Into:
| OEM Brand | Filter Model | OEM Part Number | Notes |
| Apollo Spas | — | — | Select models — verify dimensions before ordering |
| Emerald Spas | — | — | Select models — verify dimensions before ordering |
| Hayward | MicroStar-Clear C225 (in-line) | CX225RE | OEM original is 4-3/4" OD and 11-13/16" overall length |
| Pentair (American Products) | Commander II (in-line) | 57010500 | OEM original is 4-11/16" OD; legacy American Products system |
| Sonoma Spas | — | — | Select models — verify dimensions before ordering |
(This is not an exhaustive list.)
Pro Tip: Before ordering, measure your existing cartridge's outer diameter at the widest point and overall length end-to-end. For Hayward MicroStar-Clear C225 owners: your OEM cartridge measures 4-3/4" OD and 11-13/16" length — the C-4325 at 4 5/8" OD is the correct Unicel replacement for that system. For Apollo, Emerald, and Sonoma Spa owners without a specific OEM part number, confirm both the OD and length match 4 5/8" × 11 7/8" before placing your order.
Also known as: C4325
