Pentair Cartridge 520 sq. ft. | Clean & Clear Plus Filter 520 sq. ft. | R173578
- In stock, ready to ship
- SKU:
- R173578
-
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About This Item
The Pentair R173578 is the OEM replacement filter cartridge for the Clean & Clear Plus 520 sq. ft. cartridge filter, restoring full filtration capacity to one of Pentair's largest residential cartridge filter systems.
⚠️ IMPORTANT: 4 CARTRIDGES REQUIRED PER FILTER
The Clean & Clear Plus 520 sq. ft. filter requires 4 of these cartridges for a complete service. This listing is for one (1) cartridge. Order 4 to complete a full replacement set.
⚠️ IMPORTANT: FILTER MANUFACTURE DATE
This cartridge is confirmed for Clean & Clear Plus 520 filters manufactured after November 1998. Verify your filter's manufacture date before ordering.
Replacing worn or clogged cartridges restores flow rate, reduces back-pressure on the pump, and returns the filter to its rated filtration performance.
Specifications
| Pentair Part Number | R173578 |
| Part Name | Cartridge, 520 sq. ft. |
| Quantity Included | 1 cartridge (4 required per filter — see callout above) |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | Clean & Clear Plus Filter 520 sq. ft. — Clean & Clear Plus Series | CLEAN & CLEAR PLUS 520 | 520 sq. ft. system; 4 cartridges required; filters manufactured after 11/98 |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.
Pro Tip
Replace all 4 cartridges at the same time. Mixing new and worn cartridges creates uneven flow distribution across the element stack, which accelerates wear on the new cartridges and reduces overall filtration efficiency. When the filter is open for service, also inspect the tank O-ring and air relief assembly — addressing those components during the same service visit avoids a repeat teardown.
