Ok, I have not been on in around a year, having been busy with a divorce and moving to a new house brewing did not make it high up on the to do list any way I decided to pull a sample of some Mead I have ageing and had to mix up a quick one gal batch of Star San for my wine thief. Having never mixed it in a clear carboy before I was shocked to say the least when I poured approx 1/5 of an oz into the tap water and it instantly turned milky white. Being curious I then filled two pint glasses with water, one straight from the tap, the other from my RO drinking water system. I then put 3 drops of star san in each glass. The glass with the tap water instantly turned milky white, while the one with the good drinking water stayed clear and you could barely see the sanitizer mixing in with it. Should I be using RO water for my sanitizing or is the color change not going to hurt anything? Has anyone else had this problem before?