In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I have heard that some glycols leave a gummy film. I know that low temp RV type is sticky. The last thing I want in drainback (that I don’t dare use water in) is to have each cycle leave a gummy film. There seem to be many manufacturers and grades of solar HT fluid glycol. Any help on which HT fluid is the best or might dry the cleanest would be great.