For those of you using Bleach...

[stualden]

I'm just like you - CYA at 40, started using bleach this year. (I've been using pucks for 12 years, though, so for me, clearly something always eats CYA over the winter.) I seem to need a 3-quart jug of bleach every two days, so by my calculations I'm losing about .7 ppm per day.

Pool is in full sun for about 5-6 hours a day. Bather load is very light, but leaves, etc. are probably worse than most people's.

[joliecharlie]

50 CYA, holds chlorine overnight but loses 5-7ppm on hot sunny days. Full sun 9am-6pm, no shade, little debris, light swimmer load. I am running pucks again in autochlorinator set on 1/2, test chlorine nightly and add accordingly.
18x26 inground vinyl

[vanhout]

Excellent thread,

<30 CYA, 2 - 3 ppm / day

[graciec]

Dr Spike...this is off topic...So excited to see you have a dome!!!!! how do you like your dome?
We are in Michigan and I want one!!!!!! If they move this question off this board, can I ask you on the off topic board??

[medvampire]

Full sun 8 hours day. Loose about 2 to 3 ppm each day. Add 1 qt one day 2 qt the next. CYA 35 to 40 ppm.
Steve

[jmjbj_h]

My CYA is 45 and I am losing about 2-3ppm a day. Full sun and medium/heavy bather load. Mostly several kids under 6. Can anyone say...toilet? I put in a bottle a day

Joe

[Dr. Spike]

Dr Spike...this is off topic...So excited to see you have a dome!!!!! how do you like your dome?
We are in Michigan and I want one!!!!!! If they move this question off this board, can I ask you on the off topic board??

Graciec,

I do like the dome, we should move the dome discussion to the off topic forum and not hijack this thread.

[chem geek]

The answer to your question is a function of both CYA and FC (total free chlorine) levels since twice the chlorine level loses about twice the amount of chlorine per day. I now have around 15 CYA and 2-3 ppm FC and lose about 0.5 ppm per day. The pool is normally covered and is open to sunlight (it's an outdoor pool) about 14 hours per week. I used to have more CYA, but had more chlorine and the rate of loss was about the same.

[lagtime]

Holds overnight, uses ~2ppm during our very hot & very sunny days. CYA ~50, water temps 90-94.

[stualden]

The answer to your question is a function of both CYA and FC (total free chlorine) levels since twice the chlorine level loses about twice the amount of chlorine per day.

If this is the case, then perhaps we should all be reporting the percentage drop in PPM that we experience each day, rather than the PPM itself?

I wouldn't have thought it was quite that linear - certainly chlorine loss after shocking seems much faster (even in percentage terms) than regular chlorine loss.