VitaLink Hydro Max Grow A + B SW is a complete two-component fertilizer for cultivation in hydroponic systems. It contains primary and secondary nutrients with trace elements and fulvic acids. It is suitable for use with all inert media including clay pebbles, pearlite, rock wool and can be used in all circulating hydroponic systems. VitaLink Hydro Max Grow A + B SW fertilizer is designed for use in soft water areas. Use the fertilizer at a time of vegetative growth..