Sometime ago there was a discussion on the practicality of saving the condensate water from an air-conditioning unit as a useful source of de-ionised water. I assume that such water, although appearing clean, would have a certain level of bacteria present. How would this effect storage, and would it require sterilizing in someway if longer term storage would be practical? Is filtering an option? Having poured some 10 litres of the stuff away yesterday it brought the subject back to mind.