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A filter cartridge from Grainger can remove unwanted sediments, chemicals or substances to help improve water quality and make it safer for drinking. Granular-activated carbon water filters can remove rust and dirt, eliminate odors and improve the taste of drinking water. Find filters with flow rates up to 20 gallons per minute. Scale-inhibitor cartridges can reduce hard water scale in hot water systems, boilers and cooling towers. Find water filter cartridges at Grainger for all your water filtration needs.