It only lasts for a few seconds when water is added to the bowl.
Use one for a week, and your ear adjusts and the sound becomes a normal sound.
Your tub/shower will drip for 35 minutes, and I've had some people complain about that sound.
Most kitchens have ticking clocks above the range, or a clock in the living room.
Refrigerators make humming sounds
Furnaces blow air and you can hear the sucking of air from the cold air returns.
Ice makers have a filling sound when the trays are being refilled, and then a dumping sound when the cubes fall into the tray, and then a pipe banging sound when the trays are filled and the water shuts off,
Kids have an annoying sound when they ask me questions when I'm doing something. Oh, did I say that one out loud?
Come back here, let me give you a hug.