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Pentair Pentek R50-BB Big Blue Sediment Water Filter, 10-Inch, Whole House Pleated Polyester Filter Cartridge, 10" x 4.5", 50 Micron. Keep your water clean and protect your appliances by removing dirt, sand, silt and particulates. Fits all 10" Big Blue Housing and can replace any 10" x 4.5" sediment filter. Pleated Media maximizes dirt holding capacity and extends the time period between changes or cleaning. Durable, Non-Woven and reusable Polyester fabric that is suitable for a wide range of filtration uses. Reusable to extend cartridge life.