John & Bob's Penetrate Liquid Biotiller contains live beneficial microbes from our own compost tea-brewing process and Saponin, collected from Yucca plants. The live bacteria and other ingredients work together to break apart hard soil and allow air and moisture to circulate to plant roots. It improves drainage and turns hard clay into dark, crumbly soil that is easy to work with. Penetrate is a liquid clay soil treatment that comes in two bottles. One bottle contains dormant beneficial bacteria. The second bottle contains food to enliven the bacteria in the soil as well as other ingredients that break apart soil. It is liquid lawn aeration and the absolutely best solution for any hard, clay soil!