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Summer Waves 17.25 in. Dia Replacement Type A/C Pool and Spa Filter Cartridge (16-Pack) 4 x P57100204 - The Home Depot
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Amazon.com : Bestway SaluSpa Filter Cartridge (VI) 2-Pack | Compatible with All SaluSpa Inflatable Hot Tub and Spa Models : Patio, Lawn & Garden
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Filter Cartridge Diameter: 4-15/16", Length: 13-1/2", Top: Handle, Bottom: 2" Female SAE Thread, 50 sq ft by ProLine | Spa Parts + by Allied
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