Dual Stage Water Filter That Never Runs Out of Soft Water A dual stage water filter uses two resin tanks that take turns. While one tank softens your water, the other regenerates, so hard water never slips through mid-cycle. This 120,000 grain setup comes loaded with eight bags of Purolite C100E resin, the same media many water pros trust for hardness removal. A digital control head manages the switching on its own, and the black brine tank holds your salt. Bypass fittings are included for installation. For larger families or homes running laundry and showers all day, it keeps water flowing soft without waiting around. Visit : https://store.afwfilters.com/dual-120-000-grain/