Free Chlorine vs. Total Chlorine adjusting

[Truckman]

Thanks, there is hope. Anyway to knock down the CYA?? The pool
looks pretty good except the cloudiness. Is the algae still there and I just
can't see it?

[PoolDoc]

Hi Truckman;

This is the first time I'd looked back at this thread, since you posted the "100 CYA" info. That concerns me.

It *could* mean that you had much higher CYA, and now have only 100, and the CYA residue is eating the chlorine. But it *could* mean that your problem is all algae.

What worries me is that it's possible that you are getting fake chlorine readings, with is possible with test strips, and very likely with DPD tablet testing. So, please get a cheapie OTO (turns yellow) kit, and test. OTO is not very accurate, but it's bomb-proof. If OTO shows no chlorine; you have no chlorine of any kind. But, OTO turns orange at levels that bleach out OTO tabs, and turns brown at levels that screw up test strips.

So, please check. With CYA = 100, your liner can probably stand 30 ppm without damage, but you might be higher than that.

But . . . if you check with OTO, and your chlorine really IS low, then there's nothing for it besides repeated large doses of bleach, till the chlorine goes up, and stays up overnight. This is true regardless of whether the problem is algae, or CYA residure.

Ben
"PoolDoc"

[Truckman]

It is the reading with OTO. What is really confusing is the pool looks much, much better today and the Chlorine reading is lower today than it was
yesterday. It don't see any algae or residue, its just cloudy and seems to be getting better, but this is with the lower chlorine levels. I just added another
2 gallons of bleach about an hour ago so I'll see what it looks like in the
morning and do another test.

[Truckman]

So you're saying that the CYA residue is causing th cloudiness and not
algae.