Silicon is a beneficial plant nutrient, found in virtually all natural soils, but not – until now – in hydroponic nutrient solutions. Silicon strengthens plant walls producing stronger, healthier plants with larger root systems and increased resistance to pests and diseases. Liquid silicon is highly beneficial to plants in the range of 10-30 ppm in the nutrient solution. It is not, and cannot be included at these levels, in nutrient concentrates. It must be added as a separate component by the grower. Liquid silicon can be added to nutrient reservoirs each time a new batch is made up.