We have a water system with 5 homes on it and 2 North Star water softeners. We need a manuel to understand the softeners so that we can adjust them. They are about 6 feet tall and were put in in 1994. There is a panel on he front with some lights, one of which is an overload light wich never shuts off. The iron in the water is about 7.0 before the system, and 1.3 after. The limit here is .03... Can you help us?