David D - The problem is that after a hail storm last month I didn't shock and the pool developed that "that chlorine smell" and I ended up dumping in 15 gallons of bleach over 5 days till it held at 15ppm overnight. So this week after all the rain I was trying to avoid a problem. I have not heard of "gassing off" and would be thrilled to hear more. I have never registered a cc ever. Just the smell starts and I know something is different. I've also never heard of degradation, but it makes sense. At this point, I'm going to run with that answer as to why I'm loosing 8ppm in the day. Also, are you saying that people who wake up to algae always have some cc before it happens? I would LOVE a warning like that and then I could forget about the chloramine smell. I guess I've been reading too many posts about the green monster and am more nervous than a cat in a rocking chair factory about it happening to me.

Dave S - We had a ton of rain and I wanted to shock the pool before something took hold like last month. I'm wondering if I'm shocking so high, smell the chlorine "gassing off" and think it's chloramines! I will be thrilled if that is what I'm smelling. Part of my problem is that I test at 10:00pm, add chlorine per the calc, and go to bed. I don't stay up long enough to let it mix and then test again. It's 7:30 here now and the sun is still on the pool. I'm thinking it's in the sun for a full 12 hours a day. I'm not sure exactly what chlorine level I've been getting up to at night because I've always thought I had 15,000 gallons not 11,430. Dave, I would never EVER accuse you of being dense! We're not swimming because I'm trying to maintain 15.5ppm morning noon and night and my daughter likes to drink half the pool when she's in there.

Believe it or not, I think I am feeling hopeful. If cc is all I need to worry about, and if topping off the CL to 5 at night is all it takes, count me in on this pool thing. I just hope it starts to smell better as the CL level gets lower because my husband is real sensitive to it.