It works fine for about 5 years now but since recently I started to hear an extra sound when taking my shower. I think this is best described as a "humming sound", very different from the one the falling water makes. It is faint but I can hear it from outside the bathroom, when I do not hear the falling water anymore.
It looks like the sound ("music") water would make running though a loose seal (wildly guessing)
What can be the source of such a sound in the case of a mixer tap?
I am sure this must be the tap because I can hear the sound independently of the shower head that it used (they are both connected directly to the tap)