Coolant

[Jake P]

Sorry, do not see any current resource, use to be sold on eBay and Amazon. Could try to contact them direct or see if any of the eBay vendors have gallons. Otherwise I would suggest seeing if others are interested in splitting up a 5 gallon jug. Might last decades in a drip system. Also might check with David Best, he uses a similar product that he likes.

Thanks Mark!