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The Rainsoft 9577 is the correct replacement cartridge for the following filter systems:
The Rainsoft 9577 - Replacement 5 Micron Water Filter is a 10" water filter cartridge for select Culligan and Whirlpool water filter systems, and also fits Ametek, US Filter, and Plymouth #10 Blue and #10 Clear housings. This Rainsoft water filter has a 5 micron rating for the reduction of sediment, sand, dirt, silt, rust, scale, and other fine particles in your drinking water. This sediment water filter, also known as the Pentek P5, features durable spun bound polypropylne construction and a 5 gallon per minute flow rate.