I don't know if people here are familiar with the Raspberry Pi (RPi) but it is a credit card sized computer that costs about $35 (but it does need few more things to run) and only uses about 2W of power. The RPi was designed for students and hobbyists and it is easy to hook up stuff like temperature sensors or relays to it. (There is a project calle OSPi where the RPi is used as a smart irrigation controller.)
Perhaps you could also add a pH sensor and a way to estimate other pool chemistry variables. The pool computer could then log these values to the cloud (or other PCs on your LAN) or could even have its own web browser UI so that you could check it out whenever you wanted.
What if you could make such a computer with these sensors and put it in a floating waterproof solar powered case (like the Solar Breeze). You could even put a camera on it.
Alternatively you could just mount this near your pool and also connect it to relays, etc and use it to control your pump, heater, etc, assuming that you could interface to those devices. Theoretically you could integrate weather data and/or forecasts to heat (or not heat) your pool, crank up the chlorine, etc.
Someone has already connected a RPi to a Pentair Easytouch controller: http://forum.micasaverde.com/index.p...c,23922.0.html and https://github.com/dminear/easy-touch-raspberry-pi
I think this would be very cool, or am I just being too much of a geek. There is a thread on another forum about a project like this (sans waterproof solar case) here.
FYI, this is the Solar Breeze solar powered robotic skimmer