Unicel C-7491 75 Sq. Ft. Pool Filter Cartridge | 18 7/16" x 7" | Pentair/Pac-Fab Sea Horse 300
- Low stock - 2 items left
- SKU:
- C-7491
-
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About This Item
The Unicel C-7491 is a precision-engineered 75 sq. ft. replacement filter cartridge for the Pentair and Pac-Fab Sea Horse 300 cluster filter systems. Built with 150-pleat, 4 oz. Reemay 2040 polyester media and open-end caps on both ends, this cartridge delivers consistent flow and long-lasting filtration performance to demanding high-volume pool systems.
⚠️ IMPORTANT: Full Filter Service Requires 4 Cartridges
Your Pentair/Pac-Fab Sea Horse 300 and Sea Horse FSH-300 filter systems require 4 cartridges for a complete service (4 × 75 sq. ft. = 300 sq. ft. total). Replacing all four at the same time ensures consistent flow, balanced filtration, and full filter efficiency. Add a quantity of 4 to your cart to complete your filter service.
Specifications
| Filter Area | 75 sq. ft. |
| Length | 18 7/16" |
| Outer Diameter | 7" |
| Top Inner Diameter | 2 5/8" |
| Bottom Inner Diameter | 2 5/8" |
| Material | 4 oz. Reemay 2040 |
| Pleat Count | 150 |
|
Top Cap: open
|
Bottom Cap: open
|
Fits Into:
| OEM Brand | Product Name | Part Number | Notes |
| Pentair | Sea Horse 300 (Stainless Steel Tank) | R173316 (4-cartridge kit #) | Requires 4 cartridges per service |
| Pentair | Sea Horse FSH-300 (Fiberglass Tank) | R173316 (4-cartridge kit #) | Requires 4 cartridges per service |
| Pentair - Pac Fab | Sea Horse 300 (Stainless Steel Tank) | 1722840 | Requires 4 cartridges per service |
| Pentair - Pac Fab | Sea Horse FSH-300 (Fiberglass Tank) | 172877 | Requires 4 cartridges per service |
(This is not an exhaustive list.)
Pro Tip: Before ordering, verify your cartridge dimensions: 18 7/16" length, 7" outer diameter, and 2 5/8" inner diameter on both ends. The Sea Horse 300 is a quad-cluster filter — always replace all four cartridges simultaneously for uniform flow distribution and peak filtration performance.
Also known as: C7491
