Hi Tim, I've been looking back at some older posts (circa 2008) about the use of Isopropanol in conjuction with WFP. Some of your post were very positive about the benefits of adding this product to your pure water tank. Just wondering if, 6 years later, you still use this on a daily basis? As far as I can tell, the benefits include preventing water from freezing, helps water to sheet better on glass, leaves glass with more of a shine, and possibly cleans glass a little better. Would this be correct in your experience? Lastly, what ratio of Isopropanol to water should be used? Thanks a mill.