I just discarded what remained of a gallon of distilled water from Wal Mart because it was leaving behind a lot of white scale. Most of us assume that distilled water is "pure" water and that after evaporation there will be nothing left. In reality, distilled water in the store is probably whatever made it through the most profitable process of going from liquid to vapor and then condensed back to liquid.
How close to "pure water" is distilled water from a grocery store? Does a distilled water production facility use pressures, temperatures or anything else that would allow something through the process that the average homeowner would not expect? Was this just a defective bottle of distilled water from Wal Mart?
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