pH
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pH is a measure of how acidic/basic Water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
Hydrangeas act as natural pH indicators. Their flowers turn blue when the soil is acidic, and pink when the soil is alkaline. Because of this, the Hydrangea is also known as the “Change Rose” https://twitter.com/Rainmaker1973/status/1693688711618171375