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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 • 1-Pack
Low stockReplaces: Pentair R173434, Pleatco PRB50-IN, Unicel C-4950, Filbur FC-2390
XLS-404 • 2-Pack
In stockReplaces: Waterway 817-3510, Pleatco PRB17.5SF-PAIR, Unicel C-4401, Filbur FC-2386
XLS-418 • 1-Pack
In stockReplaces: Pentair R173431, Pleatco PRB35-IN, Unicel C-4335, Filbur FC-2385
Shop replacement filter cartridges for Pentair® Rainbow Dynamic 35 and 50 and DSF spa filter systems. Excel Filters cartridges are made in Austin, Texas 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.
