Here you have to distinguish between two operating modes:
Standby mode : The tank is full and no water is being drawn off. In this case, the system does not make any noise.
Treatment mode : Water has been drawn off or the tank is being initially filled. In this case, the pump starts to increase efficiency. When the pump is running, the noise level of the system is less than 40 decibels (assuming it is in a closed cabinet), which is about the volume of a quiet conversation or quiet background noise in a library. This makes it ideal for use in kitchens, offices or practices where peace and quiet and a disturbance-free environment are important. The pump switches off immediately when the tank has been refilled (within a few minutes).