Does UV cause ORP to spike?

[Saltees]

So whatever happened? Did it just end up not correlating? What was causing the ORP spike?

Inconclusive. My bad though, my earlier results were incorrect, cos the ORP probe was plugged into the PH port instead, therefore ORP constantly hovered between 100-200, despite UV and/or OZONE. Now my ORP fluctuates between 400-450 inversely to what my PH indicates, and only on UV.

 

[Randy Holmes-Farley]

Now my ORP fluctuates between 400-450 inversely to what my PH indicates.

That's normal and expected.