Hy-Gen pH Down 500ML For Hydroponics 

HY-GEN® pH DOWN contains 85% foodgrade Orthophosphoric acid and will to LOWER the pH when added to yourgrowing system. It’s recommended that you prepare your nutrient solution firstand allow it to equilibrate; this can take up to 60 minutes depending on thesize of your tank. Always add the required amount of pH DOWN to a smallseparate container of water and mix well before adding to your nutrient tank.

WHEN TO USE
Use pH DOWN every time your pH is too high. Adjust the pH only after tapwater or additives are added to your tank. Once adjusted mix well and allow30-60 minutes before re-testing and adjusting.