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How To Fix Noisy Toilets.
There is a groaning sound about a minute after you have flushed
This is a common problem but it can be hard to find in a
building with more than a few toilets. The hydraulic properties of water
cause the vibration to carry through the entire waterline system of the
building. Many people say this is caused by air in the waterlines. They
are incorrect. If there were air in the lines, the effect of the air would
be to eliminate the hydraulic properties of the water. The problem here
is the diaphragm in the fill-valve (ballcock). Even if the diaphragm looks
good, it is not. It can not be cleaned or repaired in any way. Replace
the fill-valve diaphragm and adjust the water level in the tank and the
problem will go away. The only way to identify the bad ballcock in a building
full of toilets is to shut off half of the toilets at a time near the
sound until you are down to one. This can take some time, but knowing
what you are looking for helps a lot. All the tenants of the property
will band together and throw you a parade when they see how clever you
are.