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Onlinepoolshop.com : Hayward CX880XREPAK4 425 Square Feet Cartridge Element Replacement for Hayward C4030 SwimClear In-Ground Cartridge Filter
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XLS-722 4 Pack Replacement Filter for Hayward C4020, C4025, C4030. Also replaces Hayward CX880XRE, Pleatco PA106, Unicel C-7488, Filbur FC-1226 - Walmart.com
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Amazon.com : Hayward C4030 SwimClear Cartridge Pool Filter, 425 Square Foot : Swimming Pool Cartridge Filters : Patio, Lawn & Garden
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Hayward C4030 SwimClear Cartridge Pool Filter, 425 Square Foot : Swimming Pool Cartridge Filters : Patio, Lawn & Garden - Amazon.com
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