Abstract: An ornament set includes a plurality of ornament units having double-sided adhesive sheets adhered to the back thereof, and a retainer strip adhered to the front sides thereof to hold the ornament units in a predetermined relationship. A method for manufacturing the ornament set providing a plurality of ornament units respectively having front surfaces to be displayed and back surfaces to be attached to a body to be decorated, and providing an arranging tool having recesses formed therein in relative positions corresponding to relative positions in which the ornament units are to be attached to the body to be decorated. The ornament units are positioned in the recesses of the arranging tool, respectively, such that the front surfaces of the ornament units are respectively facing the bottoms of the recesses. A double-sided adhesive tape is adhered to the back surface of each of the ornament units, and a release strip is applied onto respective surfaces of the double-sided adhesive sheets.

Abstract: A water treating method is disclosed. Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation and biological oxidation treatment, whereupon the growth of undesired aquatic chlorophyceae and microorganisms is inhibited and at the same time, organic matter is decomposed and removed, thereby maintaining a low COD level and clarifying water in the container. This method is particularly useful for keeping water in a container clean.

Abstract: Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation, whereupon undesired aquatic chlorophyceae are eliminated by inhibiting their growth. The water is circulated at such a rate that at least half the volume of water in the container is circulated per hour.

Abstract: A water treating method is disclosed. Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation and biological oxidation treatment, whereupon the growth of undesired aquatic chlorophyceae and microorganisms is inhibited and at the same time, organic matter is decomposed and removed, thereby maintaining a low COD level and clarifying water in the container. This method is particularly useful for keeping water in a container clean.