Unless you have exceptionally hard water, I wouldn't worry about the mineral content. Your just flushing it through the way AdamF described, not letting it stew. Plus if your water runs through the house filter, it's the same stuff you'll get out of the sink. I usually would forget to switch my home filter over to "bypass" when I used the hose for anything. I would go with your plan to refill it with distilled water when you do the mix.

~Adam


96 T100: D44, lockers and stuff