Posted 2/22/2012 16:04 (#2244835 - in reply to #2244830) Subject: Re: Ground loops/trenches for house geotherm education.
North West IA/western AZ
Not personally but my HVAC guy said they had problems with minerals in the water sedimenting out in the pump and lines and decreasing efficiency as well as pump problems. Treated water in closed circuit solved these problems.