Observing the operation of the dishwasher through a transparent wall or a special viewing window, the user sees only rotating jets of water, but the actual cleaning process is a complex hydrodynamic cycle, where each drop goes through a multi-stage filtration and heating system. Inside a sealed chamber water pressure is artificially increased by special pumps to ensure mechanical removal of contaminants even from the most inaccessible areas of the dishes, which cannot be done by hand washing. Understanding exactly how liquid circulates inside the tank helps you load baskets correctly and avoid common mistakes that lead to washer failure.
Immediately after starting the program, the electronics reads data from turbidity sensor and determines the degree of water contamination, adjusting the cycle duration and heating temperature in real time. Video recording of internal processes demonstrates that water is not supplied chaotically, but along strictly calculated trajectories, covering the entire volume of the washing chamber. The critical point is that the same water is used over and over again throughout the cycle through the filter system, saving resources and ensuring a consistent detergent concentration.
The internal structure of the device hides several key areas of responsibility, each of which performs its own function in the overall cleaning algorithm. The lower part of the tank is occupied by collecting dirty water and its primary purification, the middle part is occupied by rotating rocker arms, and the upper zone often remains “blind” for the lower sprinkler unless an additional water supply system is provided. We will analyze in detail each stage of this technological process so that you can visually imagine what is happening inside the metal box.
Water intake and initial mixing with chemicals
The process begins with opening intake valve, through which cold tap water under pressure enters a special mixing chamber. At the same moment, the dispenser, having received a signal from the control module, dispenses a portion of detergent, which instantly dissolves in the flow due to the turbulence of the liquid movement. The video from the inside shows how the jet hits the walls of the faucet, creating active foam even before it hits the main washing area.
The temperature of the incoming water plays a minor role, since the main heating occurs later, but its pressure directly affects the filling rate of the tank. If the pressure in the water supply system is weak, the machine may take longer to reach the required volume, which increases the total program time. Modern models Bosch or Siemens equipped with aqua sensors that stop water intake exactly at the moment when its level reaches the optimal level for the pump to operate.
It is important to note that in some advanced models there is a pre-soaking function, when the collected water is not immediately sprayed, but remains at the bottom of the tank. This allows you to dissolve dried-on food residues even before the start of active mechanical action. This approach is especially effective for the “Eco” or “Night Wash” modes, where quietness and energy saving are a priority.
To improve the quality of washing in hard water, use special all-in-one tablets; they contain softening components, which reduces the load on the built-in softener of the machine.
Circulation pump operation and pressure creation
The heart of any dishwasher is circulation pump, which forces water to move at enormous speed along a closed circuit. It is this unit that creates the necessary pressure of 20-40 bar, turning ordinary water into a powerful cleansing force. The video footage clearly shows how, after turning on the pump, the calm surface of the water at the bottom of the tank instantly turns into a seething stream rushing upward to the sprinklers.
The electronics regulate the pump power depending on the selected program: for delicate glass washing, the speed is reduced, and for removing fat from pans, it reaches a maximum. In modern inverter motors such as EcoSilence Drive, this process occurs smoothly and almost silently, unlike older models with brushed motors. Pressure differences are monitored by sensors, and if a blockage is detected in the system, the pump can temporarily change direction of rotation to clean itself.
The efficiency of the pump directly affects the efficiency of the device, since it is the pump that consumes the bulk of the electricity during the washing cycle. Engineering solutions make it possible to use the energy of escaping water to further mix the contents of the basket. If the pump fails, the machine will usually show an error on the display and stop the program to avoid flooding or damage to the dishes.
- 💧 The circulation pump provides the pressure necessary to break through dense dirt on the surface of the plates.
- ⚙️ Inverter motors allow you to smoothly regulate the flow power, reducing noise and vibration levels.
- 🔄 The system can change the direction of rotation of the pump to prevent large particles from getting stuck in the filters.
- 🔌 Energy consumption by the pump is up to 70% of the total energy consumption for one washing cycle.
Hydrodynamics of rocker arm rotation
The entry of water under pressure into the rocker channels triggers their rotation, which is carried out due to jet thrust. Jets of water shoot out of the holes at an angle, creating a torque that allows the upper and lower sprinklers to move independently of each other. An inside video shows how the water's path describes complex geometric shapes, providing 360-degree coverage.
The lower arm usually has more powerful jets designed to remove major dirt from dishes and pots placed in the lower basket. The top spray is often designed as a thin plate or rod with many small holes creating a "water mist" or "shower" that is ideal for glasses and cups. Some models Miele or Candy The upper rod can extend downward, reducing the distance to the dishes and enhancing the washing effect.
Even rotation is critical: if one of the holes becomes clogged with food debris, the balance will be disrupted and the rocker will start to rotate jerkily or stop. This will create “blind spots” where the dishes will remain dirty. Regularly checking the free rotation of the sprinklers by hand before starting a program is a mandatory preventive measure.
⚠️ Attention: Never place tall objects (cutting boards, baking sheets) in the center of the lower basket, as they may block the rotation of the upper rack, leaving the upper tier dirty.
The rotation speed of the rocker arms varies depending on the phase of the cycle. During the active washing phase it is maximum, and during rinsing it can be reduced for a more delicate effect. The design of the holes is made in such a way that the stream does not just flow, but breaks into small drops, increasing the contact area with the surface.
Filtration system and pump protection
After the water has done its job and washed away the dirt, it flows to the bottom of the washing chamber where the system is located fine and coarse filtration. The first cleaning stage traps large food debris such as bones, fruit pits or label fragments, preventing them from entering the pump. The video shows how it passes through the mesh filter, leaving visible debris on its surface.
The second stage is a microfilter that retains fine suspended matter and fat emulsions, ensuring water clarity for the next spray cycle. If this system did not exist, dirty water with food particles would simply be smeared onto clean dishes, leaving streaks and residue. Self-cleaning filters in some models are capable of crushing large fractions, but most household machines require manual cleaning of this unit.
Regular maintenance of the filter system is the key to the longevity of your dishwasher. A clogged filter increases the load on the pump, reduces the cleaning quality and can lead to an unpleasant odor. Visual inspection of the condition of the meshes should be carried out at least once a week during active use of the equipment.
☑️ Weekly filter maintenance
Water heating and chemical processes
The effectiveness of removing fats and protein contaminants directly depends on the water temperature, which in different modes can reach 70-75 degrees Celsius. Heating is carried out by flow heating element (tubular electric heater) located at the bottom of the tank or in the flow channel. In the video you can notice a slight trembling of the water or a change in its transparency at the moment of intense heating.
High temperature not only dissolves fats, but also activates enzymes contained in modern detergents. These biological catalysts begin to work effectively only within a certain temperature range, breaking down complex organic compounds. Cold water, even with powerful pressure, is not able to fully initiate these chemical reactions.
Temperature control is carried out by a thermostat or an electronic sensor, which constantly transmits data to the control board. If the water does not reach the set value, the heating cycle is extended, increasing the total program time. In energy-saving modes, the machine can heat the water to lower temperatures, but compensate for this by increasing the soaking time.
| Washing mode | Temperature (°C) | Duration (min) | Purpose |
|---|---|---|---|
| Quick wash | 40-50 | 30-40 | Fresh stains, glass |
| Eco mode | 50-55 | 180-240 | Mixed pollution, savings |
| Intensive | 65-75 | 90-120 | Heavy soiling, grease, pots |
| Delicate | 40-45 | 60-90 | Crystal, thin glass |
Draining and final rinse
After completion of the main washing cycle, dirty water is pumped out drain pump through a corrugated hose into the sewer. This process is accompanied by the characteristic sound of the pump, which differs from the sound of the circulation pump in a higher tone. The video shows how the water level at the bottom drops sharply, making room for clean water for rinsing.
The final rinse is done using clean tap water, often with the addition of a rinse aid, which reduces the surface tension of the water. Thanks to this, water does not linger on the surface of the dishes in the form of drops, but flows off as a thin film, speeding up the drying process. Rinse aid also prevents the formation of limescale and makes dishes shine.
Some models have an “Automatic Door Opening” function at the end of the cycle, when the machine automatically opens the damper. This allows hot steam to escape and fresh air to enter, which significantly improves the quality of drying without additional energy consumption. After this procedure, the dishes remain dry and are ready to be put away in the cupboard.
⚠️ Attention: If water remains at the bottom of the machine after the end of the program, this may indicate a clogged drain filter or a kinked drain hose, which requires immediate attention.
Why do dishes stay wet?
The reason may be the lack of rinse aid, the low temperature of the final rinse, or the use of plastic dishes, which dry worse than ceramics.
The quality of washing depends not only on the powder, but also on the correct arrangement of dishes, the cleanliness of the filters and the selected temperature regime.
Frequently asked questions (FAQ)
Why does the dishwasher fill with water and immediately drain it?
This could be a sign of a faulty check valve or a clog in the drain system, causing water to flow down the drain by gravity. It may also be due to an error in the water level sensor, which does not read the readings correctly.
How often should you clean the filters in your dishwasher?
It is recommended to rinse the filter system under running water at least once a week for daily use. General cleaning using special products should be carried out once every 1-2 months.
Is it possible to wash the dishwasher inside?
Yes, the interior chamber, door seals and spray arms must be wiped down periodically with a damp sponge. For deep cleaning, you should use special cleaning tablets for dishwashers, starting the cycle when the chamber is empty.
What to do if the rocker arm does not rotate?
It is necessary to check whether it is blocked by the dishes. If there are no mechanical obstacles, you should remove the rocker arm and check the holes for blockages, and also inspect the rotation bearing for scale or dirt.