Product details:

This filter is constructed of durable polypropylene string that is wound tightly around a solid polypropylene core for maximum efficiency and filtration. Part number 355222. The WP1BB20P specifications: Micron Rating 1 Flow Rate up to 30 GPM Cartridge Dimensions: 20" High x 4 1/2" Diameter reduces extra fine sand, dirt, silt, scale, rust, and sediment particles The WP1BB20P fits the Culligan / Ametek / Pentek and other brand Big Blue 20" housings. Filter life depends on water quality and usage. If you see a significant drop in pressure you should change your cartridge.