Where Has All The Chlorine Gone? Out by....

[NullQwerty]

I had the same suspicion, so I had tested it with 4 different tests. Two different drop kits from HTH, 1 strip from HTH, and 1 strip from Leslie's pools.

All give the same results. I forgot the exact reading of the CYA, but I tested it multiple times and it was always at the perfect level.

Also, after adding 1 gallon of bleach and testing 3-4 hours later, the tests showed it at 2 ppm, so the test kits are working.

Thanks!

[aylad]

Okay, I give......CYA at "perfect level" doesn't tell me anything. There is no "perfect level" for CYA. The point I am trying to make is that if your CYA is on the low side, then it may very well be the sun causing the problem. If it's not on the low side, then it could be that you have an organic load that's still consuming your chlorine, or that your minimum chlorine level isn't high enough to compensate for your CYA level, which would explain why shocking didn't fix the problem. Also, without knowing your CYA level and the chlorine level to which you shocked, I have no idea whether your shocking the pool is effective. All of these things are possibilities, but without numbers it's all just a wild guess.

Janet

[Phillbo]

OK Janet, how many fingers am I holding up

[aylad]

OK Janet, how many fingers am I holding up

lol.........