After intensive study of the directions for use, as mentioned several times here, the connections are interchanged in the description. After a week of intensive use of the filter FI switch jumps out. Despite intensive mail traffic with the distribution, the filter in homework had to be taken apart. The UV lamp was still wrapped in styrofoam foil and disassembled already in 2 parts and the glass cylinder is water. After a photo of the defective parts has been sent, I got a new UV lamp and glass cylinder. The glass cylinder you get out easily when the filter is turned kuzzeitig. This this is raised and can thus be easily removed. Here you have the cover to the switching unit, this was under water, not sent. Hopefully it holds. The filter performance is good.
