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*A medicinal preparation against Varroa mites, dissolved in water, rises in the form of cold fog under the influence of ultrasound and is blown into the hive with the help of a fan. Microparticles of the preparation leave practically no chance for survival for the Varroa mite, as they fill the entire space of the hive. But..., it remains unharmed in a closed cell of honeycombs. Therefore, the treatment should be repeated. I deliberately do not give the proportions of dissolution of oxalic acid. In the spring I will do (with video recording) 3 control treatments, and I will show you. To be sure that these proportions work. On the Internet, there are many films about this device. This development is already many, many years old.