Here, in 1972 Sander installed the first system with large protein skimmers. Two circuits of 40 m3 each. One of them for North Sea water and the other one for Baltic Sea water. The first system having been in operation for 25 years, in 1997 we could provide the complete water treatment with the same function principle again but of latest technology . Each circuit is equipt with two skimmers model Helgoland 700. A central ozone generator supplies the complete system.