Before using the toilet, the water tank (not fresh water tank) must be filled via the filler neck. To the left of the toilet cassette is the fill level indicator.
To empty the toilet cassette (every 2-5 days), press the green lever upwards and pull out the cassette at the same time. At the emptying station, turn the gray tube 90 degrees, unscrew the lid and press the thumb on opposite green button. This is for venting for faster drainage. Dump out the tank, rinse with water and fill with "Solbio" for the next use.
There is also a second sink in the back (kitchen counter on the left) and a pull roll for undisturbed toilet use (right side).