1)The motor is making a constant noise which takes away the calming sounds of water.Followed all the steps, tries to adjust water level, nothing worked. 
2) The motor touches the bowl wall which causes vibrationg noise added to the motor noise itself.Even if you turn the motor to a different direction doesn’t help.
3)Also the top portion of the fountain that has the lip to sit onto the bottom bowl,doesn’t fit correctly.Even when the wires are adjusted into the grooves.I really liked the fountain but due to above major flaws, returning it( charging for return too).
Looks good….major flaws! Not happy with the purchase:(