Step 1 of 3 for maximum soil vitality. Relieve tension in clay soils to improve percolation. Increased water penetration helps wash out naturally occurring salts that impede growth. Water and nutrients move more freely through the entire soil profile, making them more available to all parts of the root system. It also allows a more balanced microbial population to increase while the soil stays moist longer. The benefits are greatest in poor soils with a high clay content. Soil Penetrator is easy to apply through a Tree I.V. Root Feeder. Just add 1/2 ounce with a normal 5 gallon watering once every two months. 64 applications per jug!