Foxfarm, PT, Bushdoctor Sledgehammer, Liquid Fertilizer, Unique Rinse Formula Designed To Remove Fertilizer Build Up & Encourage Water Movement Through Soil & Soilless Mediums, Helps Release Surface Tension In The Soil Which Will Allow For Optimum Absorption Of Moisture & Nutrition Throughout The Plant's Root System, Derived From An Extract Of The Yucca Plant Called Saponin, Can Be Used For Both Hydroponic & Soil Applications.