Quote Originally Posted by p.p.h.
My PH is 7.4(taylor test kit) and the other (cheapy Pentair one builder gave me)says its 8.2(as high as it reads). My FC levels are 10. Pool water looks great. Should I drop in 2 cups of acid and see what happens? What should I do? Is it safe to run a higher PH with high FC levels?
Taylor phenol red is partially stabilized against interference from chlorine -- up to about 15 ppm. I'm guessing that the phenol red in your 'cheapie' kit is not.

But, that doesn't mean that your Taylor reading is accurate, either. Unless you are using an FAS-DPD testkit (no pills, just powder) you do NOT know how high the chlorine is. With test strips, levels between 7 ppm and 30 ppm usually give exactly the same results on the strip!

Ben
"PoolDoc"