KALIX Silica (Liquid) 55 GalKALIX Silica Si is a plant available silicon supplement. Key benefits include improved stem structure, stress reduction, nutrient uptake, and overall plant growth. KALIX Silica Si creates a nutrient buffer and PH stability by adding it first to nutrient solutions or stock tanks. This is particularly beneficial when using RO water. Use KALIX PH Up and PH Down for any further PH adjustments depending on substrate and growing style. Directions for Use: