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Thread: ORP Dip along with pH

  1. #1
    Regular Vistor
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    Question ORP Dip along with pH

    So at precisely 2:45 every afternoon I get a sharp dip in ORP and pH together. I have reviewed all of my programming and none of my Dos pumps are active. Both calcium and Alkalinity dose throughout a 24 hr span, nothing is a one time a day dose.
    Any Ideas as to what might cause this?
    Cheers!
    Rick

  2. #2
    Frequent Contributor zombie's Avatar
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    Check your cable routing. It could be that a device with a power cord running parallel to the two probe wires is turning ON or OFF at that time skewing the result for both. It's also possible a device is turning ON/OFF at that time that is generating stray voltage into the tank. Review your outlet log to see if anything might fit that bill.

    Sent from my SM-G965U using Tapatalk

  3. #3
    Regular Vistor
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    Thank you, Ill look and reroute if necessary. The output log shows nothing switching at that time either. I wonder if strays could be coming in through the ground probe?

  4. #4
    Regular Vistor
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    UPDATE....
    After further review and lots of notes I think I have found the culprit!
    I am dosing ESV's Transition Elements plus just slightly before the dips. So, it takes this long for it to make it's way through my system and sump before the probes pick it up. The dips started precisely the first day I started manual dosing and got larger when I increased the dosage amount.
    I will adjust the dosage amount over a two hour span vs a one time dose of 10 ml. It is hard to believe that just 10 ml of this would have such a dramatic impact on those measurements.... I'll monitor and post results this evening after the new dosing scheme to see if my guess is correct.

  5. #5
    Regular Vistor
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    Yeppers, it was the ESV TE+ causing the spikes...

  6. #6
    Frequent Visitor
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    I see you have identified possible EV spikes. Normal course should be opposite, where as pH rises ORP falls. Both of my Neptunes show this behavior. Farley has a small post on the subject. https://www.reef2reef.com/threads/rising-ph-orp.202653/

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