Neptune's Harvest Liquid Fish & Seaweed Fertilizer is made of hydrolyzed fish fertilizer from fresh fish remains from the North Atlantic and soluble seaweed (Ascophyllum nodosum). In addition to providing nutrients, it will help with transplant shock, drought, and other stresses. It can be used as a foliar spray, in drip line irrigation systems or watered directly onto plants. The product has been screened down to 150 microns so it will not clog your drip line system. It is recommended to flush the system with fresh water after fertilizing.