The Everpure 7-SO softening water filter cartridge reduces scale-forming minerals. The Everpure 7-SO replacement water filter cartridge reduces hardness in water that can cause minerals to buildup in coffee and espresso equipment. The Everpure 7SO EV960704 water filter reduces minerals such as calcium and magnesium. The Everpure 7-SO Softening Cartridge is used on water having up to 30 grains hardness per gallon (500 mg/L) at flow rates of up to 1/2 gallon per minute. The Everpure 7-S0 filter fits all existing Everpure heads. Recommended use as second cartridge in QC Twin Series configuration head. The Everpure 7S0 EV9607-04 filter's sanitary cartridge replacement is simple, quick and clean. Internal filter parts are never exposed to handling or contamination.