I just installed my aquacontoller III and it says my pH is 8.79. One test kit reads around 8.2 and the other that I have is 8.4. The pH probe is suppossed to be calibrated at the factory but I think I need to re-calibrate it to make sure the reading is right. Have others had a problem with their probes being off and where should I look to get the 7.0 and 10.0 test solutions to calibrate it. thanks also if my pH is really that high should I be concerned and how do you lower it in a 250 Gallon system? thanks