Bought a 32 oz bottle last October. Got a new bottle yesterday. The color difference is startling (it scared me anyway). https://www.dropbox.com/s/0b27kcd030bheyd/2014-11-22%2008.33.14.jpg?dl=0 I use RO for mixing and the old bottle once in solution was going cloudy immediately, within 5 minutes. pH was still fine but hard to see small items in my soaking bucket. Will save the old bottle for paint removal on beer bottles. A several day soak takes the paint off Stone IPA bottles.