I have a Pentair Intellichem, Intelliflo VSF, Easy Touch, and Intellichlor IC40 on my 10,515 gallon Salt Pool.
Over the last few week my system has been acting very weird. It has worked for the last 7 months flawlessly (installed then).
Now when ORP falls below the set point the Intellichlor kicks on just like it is supposed to. The problem is that when the Intellichlor is running the ORP drops versus goes up. It seems to drop about 5mv every 5-10 min. The Intellichlor is working and making chlorine as it now has 5ppm in the pool but my ORP is in the low 500’s.
When I shut off the Intellichlor the ORP begins to rise over the course of the next 24 hours. It will get into the high 600’s by tomorrow afternoon/evening.
Then eventually as the chlorine reduces it will drop in ORP and the cycle happens again.
Why would the ORP drop only when the salt cell runs and rise when it shuts off? I have looked everywhere but can’t seem to figure it out. I spent hours on the phone with tech support and besides sending out a tech (next week) they can’t figure it out either. The weird thing is that this just started happening over the last few weeks.
Pool is balanced...
TA - 90
CYA - 45
CH - 420
FC - 5
Salt - 3800
PH - 7.5
Appreciate any insight anyone may have.