Pre-Charge is a complete mix of major, secondary, micronutrients, and rare minerals designed to supplement soilless substrate (artificial growing mediums). The more soilless mediums such as Peat moss, Compost, and Coconut coir are generally inert and Pre-Charge provides nutrients which are needed to sustain not just microbial flora but also to induce a mineral based charge (EC) in the medium. Seedlings will respond to the right EC as if they are growing in real soil.