Pentek R50-BB # 155053 Big Blue Pleated Reusable Replacement Sediment Water Filter Cartridge Compatible With Culligan R50-BBS, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. Big Blue 50 Micron Reusable Pleated Polyester Sediment Replacement Water Filter. 10" long X 4 1/2" diameter. 8 per case, sold individually. Ametek # 155053. Same as Culligan R50-BBS. R Series cartridges are manufactured from a durable, non-woven and reusable polyester fabric that is suitable for a wide range of filtration uses. The media is pleated to maximize dirt holding capacity and extend the time period between changes or cleaning. R Series cartridges are resistant to both bacteria and chemical attack making them suitable for a variety of residential, commercial and industrial applications. Order a case and save even more.