pH testing: Taylor vs. dipstick

SteelBlue

Active member
Jul 4, 2019
34
Scottsdale, AZ
My Taylor kit and Leslie's dipstick both agree that my Free Chlorine is 3ppm. The Taylor reagent R-0004 reads a pH of 7.4 while the dipstick reads 6.8-7.0. Why the difference?
 

SteelBlue

Active member
Jul 4, 2019
34
Scottsdale, AZ
That's what I thought, but I had been reading some on-line articles that say the strips are not all that bad. Perhaps pH is not very reliable on strips.
 

duraleigh

Admin
Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
32,351
Sebring, Florida
Within reasonable cost, The drops based pH (Phenol red) is as good as it gets. It certainly is good enough for the accuracy and repeatability that TFP requires.
 

YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
10,880
Evans, Georgia
Consider that if you were making alterations in your chemistry based on that strip pH, which reading would you use? 6.8 or 7.0? Huge difference between them.

Using a test that is most accurate and repeatable also helps us help you. We know we're speaking the same "language" and can advise you safely.

Maddie :flower:
 

SteelBlue

Active member
Jul 4, 2019
34
Scottsdale, AZ
I'll go to exclusive use of the phenol red drops. I was shocked to see how far off the test strips were on pH. Too bad because they sure are easy to use!