Seed Treatment: Dilute 4ml of cool grow in 1-liter water. Then soak the seeds in the prepared solution for 30 minutes – air dry and use your hydroponic system. In Hydroponic System ass 1 ml of cool grow to every 100l of reservoir water. This translates to 90 plants being dosed with 1 ml of cool growth. Do not add cool grow pH down at the same time. The solution should not be mixed with acidic products below 6 pH.