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antole
12/29/2011, 08:49 PM
So I had a orp probe that never worked on my reef keeper because the ph and orp pro together caused interference. So I hooked it up to my new apex didn't calibrate it yet waiting for calibration solution. It is reading 435 isn't this really high if Im not using ozone. In the manual it says they don't need to be calibrated but this reading seems odd to me.