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Replacement Filter Cartridges
USA-made replacement filter cartridges for Pentair® Rainbow Dynamic and DSF spa filter systems. Match the part number on your current cartridge — or its Pleatco, Unicel, or Filbur cross-reference — for a direct-fit replacement at factory-direct pricing.
No cartridges match these filters.
XLS-408 1Pack
In stockReplaces PRB50-IN, C-4950, FC-2390
XLS-404 1Pack
In stockReplaces DSF35, PRB17.5SF-PAIR, C-4401, FC-2386
XLS-418 1Pack
In stockReplaces PRB35-IN, C-4335, FC-2385
Shop replacement filter cartridges for Pentair® Rainbow Dynamic 35 and 50 and DSF spa filter systems. Excel Filters cartridges are made in the USA to OEM dimensions — match your part number or its Pleatco, Unicel, or Filbur cross-reference for a direct fit.
Rainbow Dynamic 35 and 50 systems take different cartridge sizes, so match the part number on your current cartridge — or its Pleatco, Unicel, or Filbur cross-reference — to the Excel Filters listing before ordering.
No. Excel Filters cartridges are aftermarket replacements engineered to OEM dimensions. They are not affiliated with or endorsed by Pentair unless stated.
Some Rainbow Dynamic sizes are shared with Waterway and Sundance spa systems. Each product page lists every housing and cross-reference the cartridge replaces, so confirm the number before ordering.
