The so-called adsorption means that all solids with porosity and huge surface area are dissolved and undergo chemical and physical reactions. Medical stone, as a traditional Chinese medicine, has a good effect on skin diseases, especially pus. Medical stone is porous and has strong adsorption capacity, because its main components are silica and alumina, which is easy to understand from this point of view. In the electron microscope photography of medical stone powder introduced earlier, it has been confirmed that it is spongy and porous, which is the biggest reason. That is to say, because of its porosity and large surface area, and because feldspar is partially weathered into kaolin, it has always maintained strong adsorption and exchange.

(2) Purification of water by medical stone. Medical stone is neutral alkaline semi-igneous rock, close to volcanic rock. Natural minerals contained in medical stone are easily released, and oxygen is released from numerous small holes in medical stone. Purify water by absorbing bleaching powder and other toxic substances. Minerals such as calcium, iron and sodium emitted by medical stone can improve drinking water. Through the tap water test, it can be seen that the removal effect of medical stone on bleaching powder is shown in the following table: