General Hydroponics pH Down Liquid

Got a box of pH Down extra strength . This is the concentrated stuff for lowering the pH in your nutrient solutions. It's the liquid version, not the powder. The box says it's a 4-pack of 1-gallon jugs, though this is just the outer shipping box so it's been opened. Good if you're doing a lot of gardening or hydro work and need to keep your water levels right. Box is a bit dusty from being in the shed but the label is clear.