The invention is a method and composition for treating biofilm using a high valency silver ion. In one embodiment, the conference output is continuously buffered to provide the recorded content as the conference progresses. Transmission format setting section sets a transmission format when carrying out radio transmission based on the detection results from space multiplexing adaptability detection section. First information about one or more users is gathered. Further, there is described an apparatus or system for the treatment of a body of water, i. Soy milk products can be produced by this method simply and conveniently.