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Unicel C 4405 2 Pack 50 sq ft Rainbow DSF Spa Filter Brand_Viking Spas never soggy never soggy The one thing to get right before ordering is the thread with open 2 1 8" ends carrying molded lip seals — the raised sealing edge that presses against the housing and blocks unfiltered water from slipping around the outside of the media The Unicel C 4405 is a matched pair of replacement filter cartridges delivering 50 square feet of combined filtration for Pentair Rainbow Dynamic Series IV systems and Waterway skim filters
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