PURPOSE:To effectively purify lakes and marshes with automatic operation in a purifying device using decomposition of pollutant by bacteria, etc. CONSTITUTION:In the walls of the four sides of a support box 1 in the shape of a thin rectangular prism, two and one floats 2 are respectively fixed at each of the long sides and each of the short sides. A lot of ceramic cylindrical bodies 3, 3 are vertically inserted and fixed in each of the upper face plate and the lower face plate. The ceramic cylindrical bodies 3, 3 are formed of diatomaceous earth to be porous and each length of them is made different. A chain 4 for fixing to an anchor embedded in the bottom of lakes and marshes is connected to the lower face plate of the support box 1.
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