On an average a human breathes up to 16 times in a minute & inhales the oxygen vital to life with every breath. Under normal conditions the air contains 21% oxygen. The effects of the modern industrial society cause phenomena like smog, ozone hole, exhaust gases & industrial fog. As a consequence, sensitive persons can have a feeling of breathlessness. Even in poorly ventilated rooms, in case of increased stress in profession or daily life or under stress the oxygen supply may no longer be optimum. It is possible that symptoms like increased tiredness, headache & dullness become manifest. The efficiency reduces. Even increasing age plays a role, because with increasing the years the lungs can no longer provide adequate oxygen to the blood. In the age between 20 & 30 the lungs absorb approx. 5.6 litres of air, at the age of 70 only about 2.8 litres. The human being cannot exist without oxygen. It can remain healthy & can regenerate itself regularly only when all the cells of the body are provided with adequate oxygen. Consequences of under-supply of oxygen. Serious illnesses can develop if there is an under supply of oxygen. These include neural states of exhaustion, which could be caused by negative stress, or depression, vulnerability to infectious diseases, chronic bronchitis leading to angina pectoris, cardiac disorders, coronary heart diseases, artery sclerosis, circulatory disordersof the limbs, diseases related to age like weak hearing & vision caused by circulation, chronic skin ailments or signs of wear of the joints. Oxygen regenerates, strengthens & prevents these ailments. Still more: A good oxygen supply to the body delays the ageing process of the cells & improves the immunity against diseases. O-Pur makes it possible to balance the deficit in supply. O-Pur is medical oxygen, which is filled in convenient & light-weight tin-plate cans, in order to become available quickly. The usage is easy & quite safe. The oxygen is filled in the can under pressure by a pharmaceutically certified company in Switzerl&, in order to thus take up a higher volume. Blowing agents are not used in this method.