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The Rainsoft 9591 is the correct replacement cartridge for the following filter systems:
The Rainsoft 9591 - 10" Water Filter Cartridge Compatible is a 5 micron water filter cartridge fitting select Culligan and Whirlpool water filter systems, and also fits Ametek, US Filter, and Plymouth #10 Blue and #10 Clear housings. This 10 inch water filter reduces sediment, sand, dirt, silt, rust, scale, and other fine particles in your drinking water. This Rainsoft water filter cartridge, also known as the Pentek P5, features durable spun bound polypropylne and a flow rate of 5 gallons per minute.