How quickly to read PH level for accuracy


Gold Supporter
Aug 20, 2020
Knoxville, TN
I’m aware that FC over 10 makes the PH test unreliable.

Today, I found that with FC =9.0, the PH reading came out at 7.4 immediately after inverting the large tube. But after letting it sit in the vial for about 2 minutes, the color changed to read PH 8.0.

My gut tells me to trust the initial reading since the FC is close to the upper limit, but was hoping for some validation or correction to be sure.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
The pH test reaches the correct color hue within seconds of being shaken up. Use that. Don't let ANY test sit for any unneeded length of time.
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