Did you use 5 drops of pH reagent? Try using 4 drops and see if it's easier for you to determine the match.
I also use only 4 drops for the pH test cause my eyes more easily see the color match.
Sure. That is as high as you want to start with in PoolMath anyway.
Use enough muriatic acid to lower to 7.4 with 8.0 as your starting point. Be sure you have a new test of TA input into PoolMath.
Add the MA, circulate for at least 30 minutes, test pH again, and repeat until the pH is in the 7's.
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Your CL side of that test is pretty yellow. What is the FC from the FAS-DPD test? If above 10 ppm, then the pH test you show is not valid.
I did as well.Weird. I see some number greater than 8.2.
I did as well.
Jim, I do the following when the pH test gives my eyes a fit:
1. I start with 4 drops and try various backgrounds
2. Add the 5th drop and compare with what I saw at first
3. With both tests, I also tilt the comparator (when held directly in front of me) to where I tilt the top away from me so it's at an angle. Kind of at a 45 degree angle. Seems to help my vision a bit.
When all else fails, I throw the comparator against the wall and ask someone else to check.
I did as well.
Jim, I do the following when the pH test gives my eyes a fit:
1. I start with 4 drops and try various backgrounds
2. Add the 5th drop and compare with what I saw at first
3. With both tests, I also tilt the comparator (when held directly in front of me) to where I tilt the top away from me so it's at an angle. Kind of at a 45 degree angle. Seems to help my vision a bit.
When all else fails, I throw the comparator against the wall and ask someone else to check.
Is it critical to be that precise with pH? I'm fine with mine anywhere between 7.2 and 7.8. Would never adjust unless it was below/above that. I usually just under dose a bit from what pool math says it works out great! I would say that last test was a 7.8 and wouldn't mess with it. Or if you want add 10oz of acid and see what it does...
Is it critical to be that precise with pH? I'm fine with mine anywhere between 7.2 and 7.8. Would never adjust unless it was below/above that. I usually just under dose a bit from what pool math says it works out great! I would say that last test was a 7.8 and wouldn't mess with it. Or if you want add 10oz of acid and see what it does...
Is this 7.9?
View attachment 84150
See PH Meters for more.
Note that a PH meter does not have the inaccuracy at high FC levels.
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It really is not. I view PH as either GOOD - between 7.2 and 7.8; LOW - below 7.2 (aerate and raise PH); or HIGH - 7.8 & above (add some MA). If PH is high then assume it is 8.0 and add MA and retest and repeat until GOOD.
Does a high FC affect the meter like it does the visual test?