pH Differences in Tank compared to Sump

[ReefWaters]

Just like most people (as far as I can tell), I have my pH probe mounted in my sump.

Can the pH of your water change from the time it exits your display to the time it enters your sump?

Can I remove my probe temporarily from the sump water to test this or will the air negatively affect the probe?

Would it be beneficial to mount the probe in my overflow or the display water?

 

[Randy Holmes-Farley]

Depending on the flow and what else enters the sump (like refugia or skimmer water), it may be slightly different, but I always measure pH in the sump.

It is certainly fine to move it around and test pH wherever you want. Just don't let it dry out.

These articles may be useful:

Measuring pH with a Meter
http://www.advancedaquarist.com/issues/feb2004/chem.htm

A Comparison of pH Calibration Buffers
http://reefkeeping.com/issues/2005-02/rhf/index.htm

 

[ReefWaters]

Thanks Randy,

That is helpful. I am interested to see if there is a substantial difference and I will post to let you know what I find out.

Im a little worried because the tank drain, the skimmer drain, the reactor effluent, and the fresh water top off, ALL dump into the sump BEFORE it hits the probe. :rolleye1: :smokin:

Wish me luck!

 

[Randy Holmes-Farley]

Good luck.

I'd be surprised if there is a difference of more than 0.1 pH unit between the sump and the tank if it has reasonable flow.