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A chemical shorthand for [p]otential of [H]ydrogen, used to express relative acidity or alkalinity in solution, in terms of strength rather than amount, on a logarithmic scale. Thus, a pH of 3 is 10 times more acidic than a pH of 4. See Acidity. A pH of 7 is neutral; above 7 is increasing alkalinity (referred to as alkali/alkaline or base/basic material) and below 7 is increasing acidity.

Effectively this is a measure of the availability of nutrients in an aqueous solution. pH is an important consideration for any wash.

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