Liquid Science powdered nutrient packs are a highly soluble and extremely ph stable blend. Liquid Science has two satchels in both part A and part B. The separation into two further parts makes it much more concentrated and more soluble than other competing powdered nutrient brands. Liquid science is a full spectrum nutrient (24 elements). The 5kg pack makes 3000L and the 20kg makes 14,000L making it the best value powder line available.