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(ET) Distilled water
By definition, distilled should imply using a "still" to process water.
In some cases, contaminated water can continue to be contaminated even
after distilling if the contaminants have the right volatility. For
most water this will not be a problem. Technically, you could use
water from a dehumidifier, as the water is recovered in the second
process of distilling, but I would never use the stuff for a battery.
Remember, the condenser coils are usually aluminum, and can react with
other things, and because it is a rather cool process, it will not kill
anything that can grow. Never keep distilled water in a metal
container. Cleaning agents including baking soda should never be used
to clean a battery. Well, elbow grease is the only acceptable stuff
that you can use. Another way to produce distilled water is to use a
resin base. This is chemical distilling, and is used in laboratories
to produce water with a specific ion content ... essentially
"polishing" the water. The funny thing is that you can actually
"over-polish" the water and make it corrosive, as it will "scour" the
materials it comes in contact with to make-up its ionic balance.