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It turns out that the oxygen concentrator is relatively inexpensive, and there is one such installation for more than ten years. You can make a cocktail based on juice, milk or any other drink, even from wine. Moreover, for one portion of a half-liter glass of liquid, you need just a little. A special spum mixture is added, which allows you to hold the bubbles in the drink and is foamed using oxygen, which is generated by the device directly from the air. That is, you pay once for the device itself, it soon pays off and begins to bring net profit with minimal raw materials costs.