Answer:

A leaking flapper will produce a drop in the water level inside the toilet tank, causing the fill valve float (or pressure sensor) to activate, which usually lasts several seconds. This phenomenon is often referred to as a “phantom flush”. As the flapper continues to leak, this process repeats itself. When a fill valve action occurs (phantom flush or actual flush), water is forced into the tank at a rate that is a function of the water pressure, toilet feed-valve, and the ports of the fill valve itself. The pressurized water produces turbulence inside the tank, which in turn produces vibration. The LeakAlertor has been designed to specifically identify and isolate the vibration signature of a fill valve action and qualify it as either a normal flush cycle or a refill action in response to a leaking flapper. Easier said than done!