| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a system capable of reducing expense required to dispose and arrange the system by a simple system configuration, and also effectively cleaning and/or improving a water quality in a closed water area in the system for cleaning and/or improving the water quality in the closed water area without requiring to include a water flow generation means, without depending on artificial energy supply from the outside and utilizing natural energy. <P>SOLUTION: According to the system for cleaning and/or improving the water quality in the closed water area, a contact member formed of a honeycomb structure having a plurality of water passing holes each facing in the same direction in parallel is placed so as to vertically set a direction to which the plurality of water passing holes are oriented at a height position in a predetermined vertical direction between a water surface and a water bottom. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
