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Fits Pentair Clean & Clear Plus 420 and Waterway Crystal Water 425. Cross-References Pleatco PCC105, Unicel C-7471 and Filbur FC-1977.
SKU XLS-718 4PACK · UPC 810625025896
Confirm your fit
Pick your brand: Pentair Clean & Clear Plus 420 →Waterway Crystal Water 425 →
The XLS-718 4-pack is a replacement cartridge set for the Pentair Clean & Clear Plus CCP420 and Waterway Crystal Water 425. It replaces Pentair 178584 / R173576 and Waterway 817-0106, along with aftermarket Pleatco ULTRA-A6 / PCC105, Unicel C-7471 / C-7471RA and Filbur FC-1977 / FC-3432.
Each cartridge is 7" in diameter and 26 1/16" long with a 3" open end cap top and bottom, and carries 125 sq ft of filter media, 500 sq ft across the 4 cartridges in this pack.
We make every cartridge in Austin, Texas, and shipping is free.
Measure your old cartridge cap to cap, then across the widest pleat.
How to measure a cartridge →Measuring your old cartridge
A variance of ⅛" is normal. Anything larger usually means a different housing model — check the number printed on your old cartridge against the compatible parts list before ordering.
Match your filter housing below, click any part number to verify the fit, or paste your existing part number into the search box.
Filter housings and systems this cartridge fits
OEM and competitor cartridge part numbers this product replaces
The Perfect Fit Guarantee applies to the cross-references listed here. Brand names, models and part numbers identify compatibility only. If your housing is not listed, reach out to our team before ordering.
Can't find your part number? Look it up on the full pool filter cartridge cross-reference chart.
Still unsure after reading these? Send us the number stamped on your old cartridge and we will confirm the fit.
The Excel Filters XLS-718 replaces Pentair R173576 and 178584. Aftermarket equivalents: Pleatco PCC105, Unicel C-7471 and Filbur FC-1977.
It fits the Pentair Clean & Clear Plus CCP420 and Waterway Crystal Water 425. If your housing is not listed, match the part number stamped on your current cartridge on our cross-reference chart.
7" diameter, 26 1/16" long, 125 ft² of media (end caps — top: 3" Open End, bottom: 3" Open End). Matching measurements alone do not prove a fit: some of our cartridges share a size and differ in filtration area or end caps, so check the part number on your old cartridge too.
No. The XLS-718 is an independently manufactured replacement cartridge, made in the USA by Excel Filters and built to match the Pentair R173576 specification. Pentair is a trademark of its owner, used only to show compatibility.
Most pool and spa cartridges last 1–2 seasons with regular rinsing. Replace it when cleaning no longer restores flow, the pleats fray, or the end caps crack.
XLS-720 • 4-Pack
Low stockReplaces: Pentair R173573, Pleatco PCC80, Unicel C-7470, Filbur FC-1976
XLS-764 • 4-Pack
In stockReplaces: Pentair R173572, Pleatco PCC60, Unicel C-7469, Filbur FC-1975
XLS-706 • 4-Pack
In stockReplaces: Pentair R173578, Pleatco PCC130, Unicel C-7472, Filbur FC-1978
XLS-708 • 4-Pack
In stockReplaces: Pentair R173574, Pleatco PCM90, Unicel C-7476, Filbur FC-0675
*Perfect Fit Guarantee applies to the OEM and aftermarket cross-references listed on this page; brand names, models and part numbers identify compatibility only. We ship to the 48 contiguous United States only; free standard shipping applies to those orders with no order minimum, and expedited service is priced at checkout. Every cartridge carries a 6-month limited warranty against defects in materials and manufacturing, separate from our 30-day return policy.
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