wow , wasn't aware that glycol was organic , however , this shouldn't be any trouble for your tubing , I have ozonated drinking water that flows through tygon to my tap.. It's never had any trouble , we used tygon so we could see through it..
As for organic matter , it will nullify most anything organic in the water.. I do not however think this will have an effect on the heat transfer capabilities..
Another option is to use a UV filtration system , a closed UV product that the liquid passes through , it can kill up to 98% of all bacteria in the liquid at each pass..
http://cgi.ebay.com/ws/eBayISAPI.dll...category=20756
Like that.. --^