Jacks Hydroponic 5-12-26 25 lb. Professional Fertilizer Part A PRODUCT DESCRIPTION New design, same great product! For use on all plants being grown hydroponically Designed as a base foundation Can be manipulated to virtually any combination of nutrient levels desired Designed for both professional and home growers25 pound bag This formula was designed as a base foundation for hydroponic growing. It can be manipulated in such a manner as to provide virtually any combination of nutrient levels desired, providing the highest availability to plants, due primarily to Jack’s has proven ability to remain in true solution over long periods of time. Should be used in combination with the 15-0-0 Calcium Nitrate in a two-part system.