While you wait for answers, we may have found some information which could help you.
Click here for Trickle Water Cisterngrohe toilet cistern leasks ?
Grohe push button toilet attached to saniflow ?
How do I remove the fitting for the flush on my hidden cistern toilet?
Have I been charged way to much for having a loo mended?
Slow fill of toilet cistern?
Grohe 42181 toilet filler valve leaking?