Potassium Silicate is a nutrient control for fungus & molds. Adding Potassium Silicate to your nutrient solution helps prevent the growth of mold and fungus in plants,
helps raise the pH of the nutrient and is a source of potassium for your plant.
It is also used as a supplement (in conjunction with normal fertilizer) for the numerous benefits that increasing the availability of silicon compounds has. Silicon-containing compounds are valuable to a plant, and serve to support the plant. Stems thicken, the plant becomes more tolerant to drought and resists wilting, and the plant gets larger leaves and fruit (because the stem can support more weight). The thicker cell walls of the plant also provides an added mechanical resistance to sap sucking insects (e.g. spider mite) and various pathogenic fungi (e.g. powdery mildew).