Mr. Wak Songprasert 212 Moo 6 Bantayom Tumbon Wattayom Bangkratum District, Pitsanulok. He has three fish ponds, in the area of three rai/4800 square meters, so one pond is about one rai (1600 square meters), there were 100,000-200,000 catfish. Before using EM he used chemicals and microorganisms which he bought from the market. He did not profit because of high capital outlay. Sometimes he had deficit. In 1994, he began to use EM in his pond.