Pool Store vs Test Kit Results??

[hawkeye91]

Makes sense, so I added enough bleach last night to increase the FC to 18. This evening's results...

FC = 10
CC = 0
pH = 7.9
TA = 110
CYA = 60

I was unable to test this morning, so I'm not sure how much FC was lost overnight versus how much was lost during the day today.

I biffed on the pH -- added some acid to drop the TA and aerated at the same time. I've since read in a couple of posts that I should have dropped the pH first, and then aerated which I will do from now on. But it does bring up a couple of interesting questions...

1. The Taylor book says that the pH reading should be accurate as long as FC is 10 or less. Do you find that to be accurate? Since I'm right at 10, could that be causing an artifically high ph?

2. Any idea how quickly aeration increases pH? I added enough acid last night to drop it to 7.2 so something seems a bit off here. At least I dropped my TA by 15 points. =)

I know I should probably only tackle one adjustment at a time (yes, I'm certain I learned that in chemistry class a long time ago); but, the trial by fire has been kinda fun.

Scott

[aylad]

I have measured accurate pH with chlorine levels higher than 10 with a very similar kit to yours (that uses Taylor reagents), so I think that you're probably getting an accurate pH reading with your chlorine at 10. As far as how quickly aeration raises pH, that depends on the pool and the amount of aeration (and some on the level of TA itself). A waterfall would definitely raise pH by aeration quicker than a return pointed upward. I find that a pool full of 10-year-olds raises it rather quickly!

Janet