Installations for the treatment of drinking water, industrial water and sewage, in particular installations applying ozone for the water treatment; apparatus and nozzles for the introduction of gas, in particular oxygen or ozone, into drinking water, industrial water and sewage; surface aerators for water, filters for the aforementioned apparatus and installations.

Chemical products for treatment of drinking water, industrial water and waste water and for decontamination of soil, in particular oxidation and reducing agents, acids and bases, precipitation and flocculation agents, solvents and suspending agents, ozone, oxygen, gases containing oxygen, hydrogen, catalysts, ion exchangers, adsorption agents, foams and activated carbon as carriers for bacterial substances

Heating, steam generating, cooling, drying, aerating and air-conditioning plants and devices; waste-water purification plants, preparation plants for drinking water, industrial water and waste water, apparatus for the decomposition and purification of air and gases, reactors for gas-gas and gas-solid reactions, vaporizers for liquid gases, washing columns for purification of gases, devices and jets for introduction of gases into drinking, plant and waste water and into rivers, lakes and fish-farm waters and into contaminated soils, surface aerators for bodies of water, filters for the above-mentioned devices, apparatus and plants