Hydroponic base nutrients are designed to work especially well in hydroponics systems. What you'll find in these bottles are highly liquid, low viscosity synthetic nutrients that will not gum or clog pumps and small feed lines. Additionally, these nutrients will tend to be purely mineral-salt based, come more concentrated than organics, and will vary wildly in their initial pH. Just because nutrients are labeled for hydroponic use does not exclude their use in soil, even if it says for hydroponic applications only on the bottles. Shop now across HTG Supply's many brands of hydroponic nutrients, they all work, and it's time to find the one that works best for you!