No Chlorine?

[Watermom]

Jan,
I started replying and was pretty much writing the same thing you wrote above but deleted mine. The puzzling thing about this one is that even if she did have CYA bio-degradation over the winter, why doesn't she have a high CC reading? I've asked Ben to take a look at this thread.

[PoolDoc]

The puzzling thing about this one is that even if she did have CYA bio-degradation over the winter, why doesn't she have a high CC reading?

She *has* had transient high CC levels. The thing you have to remember is that breakpoint chlorination -- so long taught in the pool industry -- actually WORKS, when the chloramines come from simple ammonia chlorine mixes. So, 'shocking' to eliminate chloramines can potentially do just that.

[MartyW]

I don't know if this has any bearing, but I never opened the pool last year. We were out of town part of the summer and also had some remodeling done. I don't know what the cya was 2 years ago. If what you are saying is continue to shock, how much chlorine would I need? The water looks great, clear and sparkling - just no chlorine. By the way, I'm a guy. Thanks, Marty

[aylad]

With a CYA of 60, shock level is 20 ppm, and you need to sustain that as consistently as possible until you can go overnight without losing more than 1 ppm of chlorine. I don't know how much total that will be, but

[MartyW]

I've looked at the best guess chart. I'm still at a loss as to how much shock I need to put in to reach the desired level.

Marty

[Watermom]

In your pool, each quart of 6% bleach will add a little under 1ppm of chlorine. So, when you test your chlorine level, use that as a reference to know how much bleach to add to take your chlorine level back up to 20ppm.

[aylad]

With a CYA of 60, shock level is 20 ppm, and you need to sustain that as consistently as possible until you can go overnight without losing more than 1 ppm of chlorine. I don't know how much total that will be, but

Boy, that was helpful, huh Internet went out in the middle of editing that post. Thanks, Watermom, for finishing it for me!