obts,
I am very new to a glycol home system and have one through a recent vacation home purchase. I have researched it as much as I could but do not know if there is really a difference between the food-grade and automotive grade glycol other than the price. The food grade does not seem to be "fatal if swallowed" and there is no major warnings on the label. I recall the automotive grades of antifreeze being poisonous. I went with the food grade because it just seemed to be appropriate and safer. I paid about $30.00 for a gallon and mixed it with a gallon of water.
I also have 1/3 hp pump that is moving the glycol through a 15 foot vertical line but my system is not a professional power pack, just a submersible pump. It is not perfect but I get good results as long as the pump does stay on for more than an hour at a time. If so it begins to heat up the glycol even though the whole setup is in the freezer compartment of the refrigerator. I turn it off for about a half an hour for each hour it is running and that seems to be okay.
Good luck with yours
Lou
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