This set is new for summer 2017 - it is the latest enhanced model which allows you to program the cleaning intervals to run automatically. The EazyPod Automatic has both a manual cleaning button and an automatic cleaning function. When the \'Manual Clean\' button is pressed, a cleaning cycle will begin. Or the automatic function will clean the EazyPod Automatic once every three days, which can be adjusted to suit your needs. During the cleaning function, water is flushed through the system and will exit the unit via the waste pipe. The cleaning function will last approximately 6 1/2 minutes.