you could install a Levolor system (its all electronic and costs about 300-400 bucks) the only concern would be getting your sensor wire set up but there are ways to run one in an existing pool and still keep the wire hidden...
the system works by opening an irrigation valve connected to your pool plumbing to add water when the sensor prongs are not covered with water...
Thats exactly what I was about to do, run an extra zone in my irrigation system to the pool, but I would have to run the line over the top of the deck(i could paint it, so it wouldn't be tooo terrible), and it would just be on a straight timer, not on an as needed basis. I've never heard of a Levolor, I'm gonna google it...
Thanks, Paragon!!!! this might work!