After living with odd water quality issues for a few years, I just noticed that my 2 year old filter and softener are potentially plumbed backwards. I believe I have Fleck 5600 controller on top of both black tanks. If I believe the arrows on the bypass valves, the feed from the holding tank is connected to the "outflow" of the bypass valve on the carbon filter; carbon "in" is connected to softener "out", and softener "in" is connected to the house. See picture with carbon filter on the right, softener on the left.