Thank you for your help. A few other notes, we are using a becsys5, for chemical control, and the it does only give an orp. For chlorine and PH tests we are using a La Motte kit, and using taylor for the alk, and CA, The numbers I gave you were from the Palintest kit, and it was calibrated.
Our orp is roughly 780, +/- 12, as programmed. I was at 840 for a while as we had an algae problem before we got our alkalinity down to within reason.

As far as the Diamond Brite warranty, It is being refinished this summer, when we can drain the pool, as the school only has had control of the pool since last May (it was run by the company who built the pool before then) And then when I got control in September, it took until November to get our Alk balanced, as we got a acid feeder installed.
I am a student, but I am also a CPO, and have been the pool manager since September.
The other problem we have is trying to keep our Ca low, but the water we add is 400ppm, but below 500 is what the pool contractor wants, so I have been dumping and repalcing about 100,000 Gal, every week.