I am situated at Ahmedabad and builder have provided Kohler single lever diverter system in 84 flats of 4bhk. Out of 4 washrooms 3 are facing problem of running water for 30 seconds , after closing the lever. And also after using the shower when we turn on the spout the water keeps falling on our heads whole day. In one washroom it was working fine but once after changing the faulty knob it also became like another 3. Company staff have no idea whatsoever what is happening. They say it is working normal.