Hot water is hard. System may not be regenerating often enough Move bypass valve to service position. Add salt to brine tank above water level Replace seals, spacers, piston or distributor tube. Drain hot water tank and fill with soft water. Increase hardness setting.
Unit uses too much salt.
Excessive water in brine tank. Brine draw not functioning. Loss of water pressure. Iron build up in water conditioner. Inlet of control plugged.