A server receives a message from a sender and transmits the message through the Internet to a recipient. Selected others of the controlmonitor ports are used to monitor current delivered to the load. Respective hydrostatic pressures are measured at these time points. The aim is achieved in that the closure device of the bypass includes blocking elements for blocking the decoupling membrane in the first switching position of the closure device when the bypass is open and can be released in the second position of the closure device when the bypass is closed. Preferred embodiments of the composition contain a sugar solution, a sodium bicarbonate solution, saline, glycerin, water, and a preservative.