Earthlok ion exchanger reduces expansive soils up to 90%The chemical changes the clay to a non-crystalline structure by substantially reducing the negative charge of the clay. As a result water intake is reduced and the clay cannot swell after treatment. The chemical reaction to the soil is irreversible making the effects permanent. Earthlok has been in production and used in many countries since its inception in 1990. Originally used for roads and building pads when good soils were not available, Earthlok is now used in a variety of applications. Earthlok has been specifically designed not to harm the environment. Most other soil stabilization chemicals include Naphthalene Sulfonates as a dispersant for the chemical. Naphthalene in larger quantities can be hazardous to the environment and to individuals who are exposed to it. Earthlok is guaranteed with a lifetime warranty. Combine the warranty with the field results we already have on record and you can have piece of mind. EARTHLOK IS YOUR PREMIER CHOICE FOR SOIL STABILIZATION—GUARANTEED!