House & Garden Aqua Flakes is ideal for expanded clay, rockwool, growstone and various forms of recirculating hydroponic cultivation. This liquid concentrate has a unique composition that encourages rapid transfer of nutrients from fertigation into the plant foliage. The House & Garden formulation and blending methodology allows for a perfectly balanced combination of nutrients for optimum, medical-grade cultivation resulting in better pH balance, improved nutrient uptake, faster plant growth and stability in EC levels. Aqua Flakes contains all macro and trace elements in absorbable forms to ensure rapid uptake and complete nutriment for the life cycle of the plant. Aqua Flakes can be used in both the vegetative and flowering (generative state) of plant growth. For those growing in run-to-waste hydroponic systems, we still recommend the use of House & Garden HYDRO A/B. Hydro A/B is specifically designed for all forms of run-to-waste hydroponic systems.