Optics: Note 1 - Technology: Note 6 - put again from scratch please

Who knows the suffering not with the old grooved hoses, metal or plastic shell with lots of space for life forms, which one does not really want to meet.
The Grohe hose promised Remedy: Glatt. Easy to clean and a (!) Rotatable end to the unspeakable suffering knotted tubes, because mature quantum physicists are already broken.
Unfortunately, he does not do it.
A) licking The rotatable end, the rotation requires apparently a side stream which already escapes instead of the shower head before. Well you can live in a constantly damp environment.
B) He sings. Unfortunately bad. A not closer to ermittelndene resonant vibration resulting in a high swirling Sington the water flow. Which planted the laws of structure-borne noise following over fitting and walls through all the rooms continue.
And it sucks. The only positive side effect, you always know how long the shower addicted offspring have wasted the water in each room. :-)
C) Conclusion: eliminate leakage, remove singing, then it might be what. Flexible metal hoses were the old genuine but definitely. And quieter.