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An 81% solution of phosphoric acid, used to lower the pH of nutrient solutions. It is reasonably acidic of course. Though not really dangerous, pH DOWN should certainly be handled with caution.
Growth Technology pH DOWN contains orthophosphoric acid (H3PO4). The concentration is 81%, which is very strong so handle with care. Some other products on the market are considerably weaker so check the concentration before you buy. This is a very dense liquid and should feel much heavier than water.
DO NOT store pH UP with pH DOWN