The shower has been dripping since the beginning, which is not really bad, but a black film has formed on the shower rubber, but I can't find it as a spare part... Does anyone have any advice?
I had the same problem with black lining and finding the spare part. It might have been this one, but I wasn't 100% sure: https://shop.sanitastroesch.ch/siebkappe-... In view of the high price of the spare part and the fact that my shower was still dripping from the side, I replaced the entire shower.