Bush doctor sledgehammer is a unique rinse formula designed to remove excess fertilizer buildup & encourage water movement through soil & soilless mediums. Sledgehammer helps release surface tension in the soil which will allow optimal absorption of moisture & nutrition through the plant's root system. Derived from saponin, an extract from yucca, sledgehammer is organic & natural & can be used both hydroponic & soil applications. For optimal results, follow the Fox Farm feeding schedule.