Just moved house with two of these "posh" loos upstairs. Our problem is not leaking as seems to be with others, but that they do not seem to flush properly...no va va voom so to speak. A problem with 2 kids. Any ideas how to increase the volume of water flushing through?
I have the same problem, moved into a new house and the loos just won't flush properly. Both Grohedal. I opened one up and the pressure in the tube does not seem sufficient to lift the lever inside. Did you find a solution to your problem?
Desidal
January 2010
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