I have an open loop system that I use for A/C in the summer, but I use a wood boiler for heat through the winter. Because of this, the water in my exchanger and water lines just sits there. I have very hard water, and very iron-y water. From what I read, water that is not in motion tends to foil up things and leave deposits, etc. Does anyone know what would be the best way to "store" or "winterize" my open loop system through the winter months to preserve the life of the exchanger?