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Replaces Waterco 701038
Fits & replaces
This Excel Filters cartridge (XLS-938) is a direct-fit replacement for Waterco Opal XL 270, Opal XL 180, and 270. WaterCo Part Number 701038 filter systems, cross-referenced with OEM Waterco® 701038 and aftermarket Unicel C-9444. Confirm the part number on your current cartridge — or its diameter, length, and end caps — before ordering.
See the full compatibility list (4) →
Pleatco / Unicel / Filbur equivalents on the cross-reference chart →
Built to OEM dimensions for Waterco Opal XL 270, Opal XL 180, and 270. WaterCo Part Number 701038 cartridge filter systems, this replacement matches the original cartridge geometry, end-cap style, and media surface area — without the OEM markup. It directly replaces OEM Waterco® 701038 and aftermarket Unicel C-9444 part numbers — the full cross-reference list is in the Compatibility tab. Every cartridge is manufactured in our Austin, TX facility, ships free, and is backed by the Excel Filters Perfect Fit Guarantee on its listed cross-references.
The XLS-938 1PACK replacement cartridge is engineered for Waterco and built for dependable day-to-day filtration performance. Each cartridge is sized at 10 3/10" diameter x 17 1/4" length, with Open End top and Open End bottom end caps for direct-fit installation with no housing modifications.
Measure your old cartridge cap-to-cap. A variance of ⅛" is normal — anything larger likely means a different housing model.
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
Can't find your part number? Look it up on the full pool filter cartridge cross-reference chart.
The Excel Filters XLS-938 replaces Waterco 701038, and aftermarket equivalents Unicel C-9444.
It fits Waterco Opal XL 180, Waterco Opal XL 270 lower, long-element position (used with one XLS-937). If your housing is not listed, match the part number stamped on your current cartridge on our cross-reference chart.
10 3/10" diameter, 17 1/4" long, 180 ft² of media (end caps — top: 3" Open End, bottom: 3" Open End). Measure your old cartridge before ordering if you are unsure of the part number.
No. The XLS-938 is an independently manufactured replacement cartridge, made in the USA by Excel Filters and built to match the Waterco 701038 specification. Waterco 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-939 1Pack
Low stockReplaces Waterco Part # 701040
XLS-659 3Pack
In stockReplaces Waterco Part # 622830
XLS-718 4Pack
In stockReplaces R173576, PCC105, Unicel C-7471, Filbur FC-1977
XLS-722 4Pack
In stockReplaces CX875RE, CX880XRE, PA106, C-7488, FC-1226
