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The Keystone 525 filter cartridge fits the following water filter housings:
The Keystone 525 Replacement Water Filter Cartridge is a replacement water filter built with a 30 micron rating and pleated media to reduce sediment, sand, rust, and scale particles in drinking water. This Keystone filter, also known as the Pentek R30, measures 10 inches in length and has a flow rate of 10 gallons per minute.