VEG+BLOOM nutrients are the highest quality powdered plant food available for both hobbyists and commercial growers. Use the entire line for optimal performance of your indoor, hydroponic, or greenhouse garden. For larger growers, use the DOS so you can apply the nutrients using a dosing machine such as Argus, Netafim, Dosatron, or Priva. RO/Soft: For soft water at or under 250 ppm (0.5 EC) for use in coco media, aeroponic systems, and NFT. Tap/HARD: Best for hard water above 250 ppm (0.5 EC) for use in coco media, aeroponic systems, and NFT. DIRTY: Applications using peat or soil-based media. Examples include: Pro-Mix, Ocean Forest, Vermifire, Roots Organics Original & 707, and more. HD: Mixture of Tap/HARD and DIRTY. Best used for applications using inert media such as rockwool, hydroton, clay pebbles, and grow stones.