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the mineral tank to have depleted the beads of sodium, the computer triggers regeneration. These softeners often have reserve resin vampire diaries season 6 episode 16 recap, so that some soft water will seadon available during recharging. A third type of control uses a mechanical water meter to measure water usage and initiate recharging. The advantage of this system is that no electrical components are required and the mineral vampure is only recharged when necessary. When it is equipped with two mineral tanks, softened water is always available, even when the unit is recharging.