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A measure of the molecular concentration of hydrogen ions in a solution in a scale ranging from 1-14 with neutral being 7. Keep in mind that the pH scale is algorithmic-a reading of 6 is 10 times more alkaline than a reading of 5-so make changes very slowly. From 5.5-6.2 is considered an ideal range for hydroponics, depending on the grow medium or hydro method being used.

Hydro 101

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