TAP/HARD is great for all hydroponic applications such as rock wool and grow stones. Being a more acidic formula, specifically for neutralizing alkaline water supply, (200+PPMS or .4-.7 EC). When you dissolve VEG+BLOOM in to your final volume of water, the solutions now contains essential nutrients for maximum growth potential. USE WITH +LIFE and SHINE for optimum results.
*water soluble (dry fertilizer)