A circulation system for bodies of water. The funnel has a central axis with a circular intake end of a larger diameter and a circular exhaust of a smaller diameter and a tapered region therebetween. The holder shaft portion is inserted into a shaft hole formed in a winding center of the tape roll and rotatably supports the tape roll. Each section can be a panel with a polygonal shape. The floor coating includes components that are reactive to these two or more wavelengths such that substantial or complete curing of the floor coating may occur upon simultaneous exposure to the two or more wavelengths. In a cross section orthogonal to an extending direction of the cells, a shape of the cells is a rectangular shape, and a thickness of a portion of the collecting layer which is positioned in each of corner portions of each of the cells is from one to three times that of a portion of the collecting layer which is positioned in the center of each of sides of the cell.