How do toilets draw water down?

Stop flushing the toilet

Most households have toilets with cisterns

In the meantime, cisterns have long since established themselves in toilets. There are also flush valves in existing buildings from the 60s and 70s. But these can hardly be found anymore. A distinction can be made between different systems for the cisterns:

  • Concealed cistern
  • Surface-mounted cistern
  • cisterns placed on the toilet
  • cisterns hanging on the wall (normal and high hanging)
  • Cisterns integrated in a pre-wall installation

All cisterns work similarly

Regardless of the system, the scheme according to which the cistern is filled with water is always very similar. Only with cisterns behind a pre-wall element do you only have access via the opening behind the flush plate. Therefore, you absolutely need a flashlight. Otherwise, the system of modern flushes is always similar.

Structure of the toilet cistern mechanism

To understand what to do, you should understand the structure of a toilet cistern. In the following we describe a modern cistern mechanism. The float can also be made of rigid foam and regulate the inlet using a lever:

  • Inlet valve with float and plastic threaded rod
  • Overflow that opens when the flush is activated
  • Mechanism for actuating the flush

Step-by-step instructions for setting a toilet flush

  • possibly a new inlet valve
  • possibly hemp for sealing
  • Water pump pliers
  • screwdriver
  • flashlight

1. Open the cistern

a) Wall installation

In the case of a pre-wall element, you have to remove the push plate. Underneath is the flush plate module, a frame that you can also remove. The pusher plate is usually fastened with clips, whereas the module frame is screwed on. The flushing is usually actuated by means of a cable pull.

b) Conventional toilet cistern

In the case of ceramic cisterns, the heavy lid is usually just put on. In the case of plastic versions, however, they are attached with clips. You can lift the lid with a brave jerk. Depending on how the cistern is operated (to press in the middle, pull or to the side), you can remove the cover immediately or you have to unhook the rods first.

2. Set the inlet valve with the float

The inlet valve is vertical in the cistern. A plastic float that can be moved up and down is mounted in front of or around the tubular valve. It is held up by a stopper on a plastic thread. There is an adjustment wheel either above (as an extension of the thread) or on the side.

If you turn the setting wheel to (to the left), the position of the float is set to the bottom. This means that the valve switches off the water supply earlier. If you turn the setting wheel to (to the right), the position is shifted upwards. Now the water inlet remains open longer. With the appropriate setting, you can now determine the exact amount of the inflow.

If you want to set the toilet flush float due to a defect (water runs in too slowly, water runs out permanently and overflows at the cistern overflow, etc.), you should first consider other steps. This includes descaling the toilet and cleaning and repairing the toilet flush. In combination with this work, you should reset the toilet flush.