I think it is just that easy...I have also been doing some quick research
, and it seems that PropyleneGlycol is commonly used as a solvent in chemicals, both food
& non food
. Very interesting about the dissolved oxygen. It actually consumes the oxygen at the surface layer, apparently starving the micro organsims of their oxygen supply.
Antifreeze is only one of its uses. I do not profess to be a Chemical Eng, however from what I can gather, if you have 100% pure Polpylene Glycol, you are good to go.
More info here Propylene Glycol : Propylene glycol properties
If this is as simple as it seems, the AF manufacturers will find some way of getting this stuff banned, or at least listed as a Restricted Product...