Reading PH

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.
Dianne
Pool Newbie
Pool Newbie
Posts: 1
Joined: Mon 12 Jun, 2006 22:49

Reading PH

Postby Dianne » Mon 12 Jun, 2006 23:02

I use Taylor reagents for my pool water testing. My PH reads 7.2 and total alkalinity is 180 ppm. I noticed that if I put a drop of Thiosulfate into the color comparator for testing PH (using Phenol Red), I get a different Ph of around 7.4 .
Is it good practice to add a drop of thiosulfate to eliminate the chlorine prior to testing PH?
I am curious if the chlorine(especially after shocking using Dichloro)could possibly "bleach out" the phenol red reagent color and give a false low result.
Also, what is the best light source to use when checking for PH using a color comparator?


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