Hi all , I want to mix the chemicals for developing. I have read through many forums that say clean tap water or distilled water is good enough to make a stock solution. I live in a place where the tap water is hard and not good enough. So I don't want to take chances. I've bought a gallon of distilled water, but it says "iron free only", for usage in batteries. I was wondering if this is good enough for making a stock solution. Thanks in advance Rohan