The noisy toilet cistern is not an uncommon problem and occurs in many households. It is quite an annoyance, especially if the bathroom is close to a bedroom.The reason for this noise is that cisterns are normally the most hard working parts of a domestic plumbing system. A Roehampton Plumber is a qualified professional. In the past, to cure water splashing it was ok to connect a pipe into the outlet of the valve so that it hung vertically below the level of the water. This solved that particular problem, but there were concerns that this might cause water back-siphoning through the silencer tube into the mains supply. This led to rigid tubes being banned in favour of flexible plastic silencer tubes. These seal by collapsing should back-siphoning happen. The fitting of a silencer tube is also able to prevent noise known as water hammer. Water hammer is a rhythmic thudding that transmits along the pipework. This can often be the result of ripples on the surface of the water in the cistern, caused by a heavy flow from the float valve. Roehampton Plumbers only employ qualified tradespeople. When the water level rises, the float arm tends to bounce on the ripples and hammer the valve, the sound is then amplified and transmitted along the pipework. To cure this, a flexible plastic tube is fitted that stops the ripples by introducing the water under the surface. If the water pressure through the valve is too great, the arm begins to oscillate as it tries to close the valve, and causes the water to hammer. This can be cured by fitting something called an equilibrium valve. As water flows through the valve, some of it is introduced behind the piston diaphragm to equalise the pressure on each side, so that the valve closes smoothly and silently.