no peroxide, no ozone, I have a ton of turnover and water movement though, so I’m guessing minimum CO2 in water column. I have never seen it so scribbly on the chart as well as so high. I disconnected the CO2 scrubber to see if it made a difference. I feel like the probe is failing though as I can’t believe my ORP is this high the way I feed and dose aminos. Other than reading high everything looks to be okay.