I grow in Hydro and soil. But the only time I use it is when my Res temps were getting questionably high 73-78* and there was a threat of pythium in hydro. You really have no use for it in soil other then oxygenation or if your plants got over watered . If anything I would of got the %3 and added a couple tbsp to each gallon at watering time. It does destroy organic proteins, carbs, and enzymes. So I wouldn't really use it at all if your organic because its destroying all your beneficials.but if your just using reg chem nutes it's fine and actually really good becuase at adds tons of oxygen to your water and is easily absorbed by the roots.