Pentair Pentek R30-20BB Big Blue Sediment Water Filter keeps your water clean and protect your appliances by removing dirt, sand, silt and particulates. It fits all 20" Big Blue Housing and can replace any 20" x 4.5" sediment filter. The pleated media maximizes dirt holding capacity and extends the time period between changes or cleaning. It is manufactured from durable, non-woven, and reusable polyester fabric that is suitable for a wide range of filtration uses and reusable to extend cartridge life.