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The Keystone GC20-20 compatible is a filter cartridge that fits the following filter housings:
The Keystone GC20-20 compatible replacement Pleated Water Filter is a 20" water filter with pleated cellulose construction that reduces sediment, sand, dirt, silt, rust, scale particles, and more in drinking water. This water filter has high dirt-holding capacity and a 20 micron rating. This Keystone compatible water filter, also known as the Pentek S1-20BB, has a higher flow rate, 10 gallons per minute, through its extended length.