pH level is  a measure of how acidic or basic water is. The range goes from 0-14. A level of 7 is considered neutral. There is a 10 fold change in pH per level, so a pH level of 9 is considered to be 10 times more acidic than a pH level of 8.  Above 7 is considered acidic and below 7 is considered alkaline.

The reason the pH level is so important is that it is a clear indicator on if there is chemical change in the water.

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