O₂-Generator generates gaseous oxygen of a purity of 90 % - 95 % on the basis of the adsorption principle PSA (Pressure Swing Adsorption). The PSA-process separates the naturally in ambient air existing oxygen (21 % oxygen, 78 % nitrogen, < 1 % noble gases and other gases). This is an unambiguous physical process. The compressed air passes a molecular sieve, which adsorbs nitrogen at a high pressure and releases it at a low pressure. The O₂ generators are widely used for oxygen aeration active mud processes, re-aeration of surface water, fishes breed aquatics, industrial oxidation process, humid oxygenation.