Why pipes hum in the toilet.
Actually, there are many such reasons, it is not meaningful to disassemble in detail everything. Suffice it to distinguish the most common: 
- Poorly installed pipes. This implies the loose connection of pipeline parts and the formation of cracks;
- The increased pressure in the water pipe, which is very simple to check, it is enough to turn on the water in the tap for a maximum and see and evaluate the head pressure. This test method is suitable in cases where noise occurs when the valve is opened and closed;
- Reducing diametral dimensions of pipes. The natural process of wear of metal structures, when the inside of the pipe is covered with plaque and rust. In this case, there is a decrease in patency with constant water pressure in the pipes;
- Defective plumbing. This can be anything, from wear of the gasket to the mixer and ending with faulty cranes. The reason may be in one place, but audibility in the whole house. Instability in the operation of the pumping station. The equipment, which has been in operation for many decades, is gradually breaking down. Wear of parts and mechanisms and leads to the occurrence of vibrations.
Actually, the sound is produced by a ball valve, which regulates the water supply to the tank. This may mean that there is no hose or a hose whose function does not allow the occurrence of buzz. All you need to do is buy and install the necessary part.
Methods for eliminating acoustic defects.
It is not difficult to solve a problem, it is difficult to determine its location. If you have recently done repairs and are sure of the health of plumbing, the case may be in unstable pressure, it is enough to determine the problem area. To do this, carefully listen to what sounds come from the pipe and in what particular place, and if there is a leak, you will immediately find it on wet tracks.
If everything is in order in your apartment, and the buzzing or "howling" of pipes in the toilet, in the bathroom or in the kitchen continues, contact the neighbors, they may be the ones who are responsible for the inconvenience, and together you will solve the problem. It is not difficult to repair the malfunction, wrap a sufficiently damaged joint with a rubber harness and fasten it with a wire or clamps( clamps).
And if this section of communications is in the basement and is on the balance of communal management, you yourself can do nothing. It is necessary to apply with the application to the housing-operational office at the place of residence.
Another kind of extraneous sound is "tapping".The reason for this can be either the curvature of the pipes, or the breakage of the valve in the valve. The deformation is removed by an additional fastening, and the faulty valve is replaced with a new one. It is worth noting that the curvature is inherent only in metallic communications, and this is another proof in favor of plastic pipes. Thanks to good sound insulation, even with a multiple increase in the tube when heated, the plastic pipes will function completely silently. 
How to prevent the hum of pipes.
Observing some preventive measures, you can avoid such troubles:
- Replace old metal or cast iron pipes with plastic ones;
- Instead of obsolete valves, install modern ball or single-lever valves;
- Replacing an old valve and gasket is also capable of providing quietness in the water supply.
