To contrive an environmental improvement such as purification of atmospheric pollution and purification of contamination in water by utilizing a lot of pieces of functional ceramic products in bank, river/pond and rooftop of building.

The ceramic products 2 are flatly put into a netted fiber bag 1 having rectangular wide surfaces. The mesh has a size enough to hold the ceramic products, the netted fiber bag is traversedly parted in a rectangular shape and is squeezed on the position where the ceramic products almost can be fixed. The ceramic products are porous and are coated with photocatalyst TiO2. The network fiber is made of a general purpose resin, biodegradable resin or stainless metal. Since the netted fiber bag 1 into which the ceramic products are put is rounded in whole, is spread and used in a job site, it is easily applicable and easily exchangeable.