Hard water contains dissolved minerals in the form of Calcium (Ca), Magnesium (Mg), and Iron (Fe). Removal of these minerals is accomplished by softening the water through an ion exchange process using a water softener. As the water flows through the mineral tank of the Water Purification System, the dissolved minerals become attached to the resin, creating soft water. Over a period of time the resin in the Water Purification System will become exhausted, and the Water Purification System will regenerate using a brine solution produced from the salt in the brine tank. Metered Water Purification Systems (or Demand Water Purification Systems) are prompted to regenerate based on the amount of water that has passed through the unit. Like the timered softeners, these can be programmed to regenerate at a certain time of day. Instead of regenerating on a specific day as a timered softener does, the metered Purification System does not schedule a regeneration until the specified amount of water have passed through the System. These units can save water by preventing unnecessary regeneration since it does not regenerate until the resin is near its capacity.