Rambridge Quality Potassium Silicate has purity you can see. Very compatible with plants. Hardy plants can better resist mildews, molds & fungus like Grey Mold and Powdery Mildew and helps raise the pH of the nutrient and is a source of potassium for your plant.
pH Adjustment: Add to your nutrient to bring your pH up.
Add 1/4ml per litre of nutrient. Adjust pH to 6.5 after adding.