I've been have been reading alot about open loops systems and since we have hard water in our area it seems that a few years down the road I might run into problems. One geo company with roots in europe says that they always run external heat exchangers so that your well water does'nt run through the geo unit. Then a a simple closed loop system from the heat exchanger. This sound good to me, but what are your guy's thoughts of this. Do you under stand what I'm gett'n at here?