Does running carbon cause ORP drops?

Greenjeans · Mar 19, 2020

I was noticing a cyclical drop in my orp, and the closest correlation that I can make is to sometime after the carbon reactor has finished it's 4hr cycle...

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Dan_P · Mar 19, 2020

Each ORP drop is a different size and time of day. Not obvious that it is related to reactor use.

Greenjeans · Mar 19, 2020

Agreed...If you kind of guesstimate an average time of the drop relative to the carbon pump, it seems to consistently fall about halfway between cycles, or every 11-13hrs. (The carbon is running 4hrs on 8hrs off osc)...just thinking out loud, and wondering about these sudden ORP drops

taricha · Mar 19, 2020

The drop is like you say, every 12hrs or so. You don't have anything that turns on or gets added or feedings that would sync there?

Greenjeans · Mar 19, 2020

nope..feeding is done manually am/pm, UV and skimmer is on 24/7, DOS pump is set to spread the alk dosing over the whole day. The carbon is the only regularly periodic thing I've got on the system, and the carbon is maybe a week old at this point

Greenjeans · Mar 19, 2020

I guess the next experiment is to change the carbon reactor cycle and see if it affects ORP so directly...

Randy Holmes-Farley · Mar 20, 2020

If you stop a GAC reactor (or any reactor) and trap water in it, ORP in that water will drop severely. When restarted, it dumps that bad water into the tank. I would not time a rector this way.