If I could give it -0 stars, I would.  It was a complete waste of money.  One light went out during the FIRST USE and the middle bowl never drains into the bottom bowl.  The entire unit also leaks, so you have to watch the water level or you'll burn the motor.  Lastly, the water sounds like a toilet bowl and it's very loud.  Adding pebbles, medium size stones or large stones does nothing to the sound, but it does make the water splash out, so you can't do that either.  I have experience with fountains so this is extremely disappointed and only used for 3hrs!!