I bought a house that had a carbon filter which pretty much took the smell out of the well water but the water tasted rusty (even though it tested negative for rust.) Since it was an old system I bought a new mineral filtering system. It took the smell out of the cold water, but the hot was rancid. So the company sent me a chemical feeder to shoot small amounts of chlorine into the water before it went to the filter. This should work but the plumber who installed it messed something up. First he put a check valve with made the water which went to the barn quit working unless you turned the water in the house on first. He came and took that off but then the chlorine (or pool shock which we also tried) started coming out to the barn. Now both the cold and the hot water smell. I am certain that something is hooked up wrong but I don't know who to call. A regular plumber doesn't necessarily know the configuration for whole house iron filters or chemical feeders and local water companies just want to sell you their product. I need to know who to call to get it all working again, without affecting the water that goes to the barn. I have lost 3 tenants in this house in 6 months because they find the water unbearable.