Using a high-quality micronutrient formula is your ticket to a rewarding garden. By combining Advanced Nutrients Micro with Grow and Bloom, you're providing your plants what they need to give you a happier harvest day. It's Guaranteed. Micro has been specially designed for use with all hydroponics, sphagnum and other growing media. Micro has been developed for use with any and all hydroponics and continuous liquid feed growing systems (aeroponic, drip irrigation and emitters, NFT, flood & drain).