Very interested. I'm gathering you didn't want to rely on a well or public water supply. Makes absolute sense that you don't want parasites, pollutants or other contamination getting into your supply. If you need a purification system, might as well get it to potable water stage. Or do you keep your bathrooms, water fountains, sinks, etc on a separate system?
Potable water comes from a deep well that's adequate for our flow needs. Part of the problem with our land is the deep wells could only get 15-18 gallons per minute and we need 100 gpm coming in. We can burn 400-500gpm hence the 55k gallon tank.
Public water was going to be $370k to $800k to pipe in, plus the actual monthly bills.
Do you have sensors built in yet? Seems like even dissolved ozone, flow, temp and Ph sensors would give you warm fuzzy feelings about the efficiency of your process. They're relative cheap for the piece of mind you'd get. After that, you'd solely need to send spot samples off to the labs for more detailed analysis.
Dissolved ozone you can't really do... dissolved oxygen you can but ozone is different. We use ORP to indirectly measure that... but the nice thing is it also measures other oxidizers. So I can do ORP post ozone and ORP post chlorine and it's all kind of meaning the same thing. Temp I don't really care about and flow is tricky because the flow sensors we do use don't have any computer interface to them. Kinda stupid but that's how it goes.
But for pH and ORP it'd be nice to have a system that could sample every 5 seconds, log it to MySQL, have the ability to operate a solenoid to turn the chlorine pressure either on or off. On if ozone isn't enough and back off if the chlorine ORP is getting too high. Then it'd be really nice if there was a web interface so I could check on the thing from my phone and if the same relay board that was working the solenoid could also close a loop to trigger a Sensaphone to call out if things got REALLY bad that'd be great. If only.
Oh yeah.. built one! Not seen is the 24VAC transformer or any wiring into the relay module.
Now, this is going to be a completely left field notion, but any reason why you went with this instead of say partial vacuum distillation or vapor compression evaporation? Wouldn't matter WHAT the source feed was contaminated with, it wouldn't come across the water. You'd probably want to add some stuff to the distilled water (trace minerals or whatnot), but it'd be a very very simple process that wouldn't require an ozone generator, chlorine, Ph sensitivity, etc. Your current setup is great for dealing with biological contamination, but not necessarily particulates, chemicals, metals, etc. I know you went your route specifically and looked at alternatives, and I'm guessing acid sanitizor/o3/chlorine due to flow rate and cost. But still curious, because... well, curious. 
Never really thought about one. It's not something I've seen on the market for ag purposes and I can guess why. You actually want some of the metals and other impurities in your water. Plus you still need something like chlorine or another oxidizer to clean the pipes out and pH/alakalinity management is always needed. If you went with distilled water that was balls even 7.0 pH and then you put your fertilizer in you'll knock the pH down. With no alkaline particulates in the water (like calcium chloride) you'd eventually "eat" the lime buffer put in potting soil down and drive the pH of the soil too low for some crops. Geraniums are going to be the first to show it if your pH gets too low.
So, you end up doing this weird balance with pH where you try and keep the pH of the water around the 6.5 to 7.0 range but you leave enough alkaline particles in the water to replace the lime in the soil as you water. Target range is usually 60-80ppm alkalinity in the water. Higher than that and you can experience some build up. Lower and you strip the medium.
I swear I do more math and science in Ag than I did in IT.
I'll try and pop a cell phone video out tomorrow.
