General Hydroponics® Hardwater FloraMicro 2.5 Gallonprovides a unique combination of mineral nutrients and state of the art organic chelates You can custom blend a formula based on type of plant and phase of growth Mix special formulas for starting cuttings or seedlings, foliar feeding or other specialized needs. Excellent for use in all growing media, including rockwool, Hydroton clay aggregate, soil and aeroponics. Can be Used Indoors and Out