1.   Next, feed about three feet of the auger cable down through the overflow tube pushing it in with steady pressure while turning the crank on the handle.

2.   Pour Lime-Away . . . or Lime-Buster . . . into the overflow tube and the let the chemicals soak away the mineral deposits for about an hour. . . .

3.   The homeowner looked long and hard at the innards of the tank, until she noticed the little tube that fills the overflow tube seemed quite low.

4.   The overflow tube lets water flow into the bowl and eventually down the drain.

5.   The water keeps rising and eventually spills over the top of an overflow tube at the center of the toilet tank.