I use the same non-tox stuff when I winterize my place and never worry about it. I blow out all my supply lines with the compressor so the only place I have antifreeze is the drains. I just clear them all once I have the water up and running, and before I leave after opening up I throw septic treatment into my system to keep the bacteria count up. In fact I treat mine about every mid season and once before I shut down. I was pumped out a couple years ago for the first time since I owned my place and everything appeared to be normal.
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