Everpure HT10 Water Filter Cartridge EV979922 Specialty Cartridges The "S" at the end

The "S" at the end of 4FCS stands for 'scale'

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2SRBW spec sheet

Everpure HT10 Water Filter Cartridge EV979922 Specialty Cartridges The "S" at the endApplication: Commercial Dishwashers, Glassware washers and Warewashing Booster Heaters The HT10 water filter is the replacement filter for the HTS 11 Kleenware System, which is a high capacity, high temperature scale reducing water filter that removes existing scale deposits in warewashing machines and booster heaters. The HT10 HydroBlend media protects against corrosion and helps prevent future buildup of scale. Replacement cartridge for HTS 11