Apparatus for ventilating, water supply and sanitary purposes; water treatment, sanitation, purification, and sterilisation apparatus, machines, and installations, in-situ apparatus for treating ground water to control bacterial growth, bioremediation apparatus for treating bodies of standing or flowing water, including aeration and sparging apparatus, parts and accessories in this class for the aforementioned goods

Water supply and sanitary purposes, control of algae in lakes, dams, streams and tanks