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pH Down - Acid is formulated using food grade Phosphoric acid - pure plant nutrient. Just add a little at a time if your nutrient pH is too high and this will lower the pH to within range. Simple, reliable and effective.pH Down - Acid is formulated using food grade Phosphoric acid - pure plant nutrient. Just add a little at a time if your nutrient pH is too high and this will lower the pH to within range. Simple, reliable and effective.