Swimming pool water level control apparatus

DETAILED DESCRIPTION What is claimed is: 1.
Swimming pool water level control apparatus, comprising, in combination: means for sensing the water level in the swimming pool located remotely from the swimming pool, including means for sensing a preferred water level in the pool and for sensing a water level less than the preferred water level; and control means for controlling water flow to the swimming pool in response to the means for sensing the water level, including means for providing a first output signal in response to the sensing of a water level less than the preferred water level, timer means actuated by the first output signal for providing a second output signal for a predetermined time period, valve means for controlling a flow of water to the swimming pool, and means activated by the second output signal for opening the valve means for the predetermined time period to allow water to flow to the swimming pool during the predetermined time period.
2.
The apparatus of claim 1 in which the means for sensing the water level in the swimming pool further includes a cylinder for receiving water from the swimming pool and located remotely from the swimming pool, and a conduit extending from the swimming pool to the cylinder through which water flows to the cylinder for indicating the height of the water in the swimming pool.
3.
The apparatus of claim 2 in which means for sensing the preferred water level and a water level less than the preferred water level includes means for generating a light beam, means for generating an output signal in response to the generated light beam, and means for interrupting the light beam in response to the level of the water at the preferred water level.
4.
The apparatus of claim 3 in which the means for interrupting the light beam comprises a float movable vertically in response to the water level.
5.
The apparatus of claim 3 in which the means for interrupting the light beam comprises a prism disposed within the cylinder whose light refracting characteristics change in response to the level of the water