Yeast re-hydration question. I am going to treat the wort water before putting heat to it with a campden tab to remove chlorine/chlorimine at a rate of one tab per 20 gallons. My thought was to use some of the treated water for re-hydrating the dry yeast so it is chlorine/chlorimine free. I was going to scoop some out of the kettle and boil it in the microwave. Will the campden hurt/slow the yeast hydration process? If it does, I have an RO and was thinking of using purified water for the re-hydration process. Problem is, I keep reading that you need to use tap water for re hydration since the yeast needs the minerals and RO water is near deionized water. My RO water is around 3-5 TDS. Thanks for any advice!