I have read (and I do this, now) that chlorine will evaporate from water left to sit over night. I just fill my ale pail with the water I'm going to brew with and it is fine. However, this is the reason many systems now use chloromine, so it doesn't evaporate. You just have to check which you local water supply is using. But! Filtered water is tasty, so a good home system is also nice.
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Mmm, beer.
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