The EasyClean flush back function: Switch position “Filter” Normal operation – the water passes through the pressure pond filter with the help of a pond pump and returns cleanly into the pond. Switch position “Clean” Cleaning mode – By turning the switch the motor that is integrated in the top of the filter is switched on and makes the filter sponges rotate in the inner of the pond filter and cleans them from the coarse dirt without opening the pond filter. During the cleaning operation the dirty water is drained by an additional connection and can be used for example for garden irrigation. Filter Placement: The filter is placed at the pond side and by means of a a suitable pump (not included in delivery) connected with the water. The water circulates through the filter and the UV-device and after being cleaned is led again into the pond.