Is anyone using an ethanol proof floating type meter to measure isopropyl? How do you calibrate it? How do get the water out of your isopropyl? Reflux with lime? There’s a Reddit post saying add nacl and decant, does that do it? Or mol seives? 3A, 4A?
Also, is the 91% isopropyl they sell for$10/gallon at Walmart typically contaminated? Wondering if we can purify and use that for extraction, but haven’t taken the time to track down the purity certificates.