When you mix Advanced Nutrients Bloom with Grow and Micro, you get 3-part base nutrients that provide bud-building potassium and phosphorus combined with other elements to give you vigorous growth and a happier harvest day - guaranteed. Bloom has been specially designed for use with all hydroponics, sphagnum and other growing media. Promotes healthy plants and fastest growth possible Pharmaceutical grade precursors More chelates per micronutrient than other manufacturers Nutrient absorption from a broader pH spectrum Concentrated, less-expensive formula