In some ways you are correct, there is an added cost for sensors, pressure, flow and amps. No need for any read outs. Everything would be displayed at a PC. The PC is only used for displaying data and storing historical data (trends). I do not know why anyone would want to use the PC (linux or windows) for actual control, they are not made for that type of control. I would use a PLC (programmable logic controller).

I’ve designed/written code for large Ultra Pure Water systems which is basically the same…just a lot more equipment and processes.

What it comes down to is that I am a nut and really enjoy this kind of stuff. Yes it may be over kill, but hey, is BIGGER ALWAYS BETTER!!! I think I could easily do it for less than $5,000. On the other hand, if I ever sell the house, would anyone have a clue how to use it?

Who knows, I may or may not add automation to the pool. I have been looking at some of the off the shelf stuff, like the Pro Logic from Hayward or the Intelli stuff from Pentair. Although I am a little worried that it is like most home automation stuff….cheaply made, overpriced, and nonadjustable.