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Anonymous
Hard water isn't bad for you. You're mainly looking at sodium, magnesium and calcium ions and their associated mates, chlorides and carbonates.
If you want to get rid of those ions without having to purchase water, go the distillation route, since filters don't deionize water.
Also, keep in mind that in the US, tap water quality is regulated by the EPA, while bottled water is regualted by the FDA. The EPA's standards are more stringent, as are their reporting guidelines. It's pretty easy tracking down your local tap water stats to find out what's in it. But it's almost impossible to find out what's in bottled water, since in most cases even the producers don't know with any detail.
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