I've hunted around on the site and have not found an explanation of the exact nature of the relationship between the CYA in the pool and the loss of chlorine levels when the sun is out. I read that if my CYA is at 50, chlorine won't be lost to the sun.
And I see this on one of the PoolSchool pages:
"If your CYA level is too low, most of your chlorine will be lost to sunlight, instead of fighting algae"
Can someone tell me exactly how the chlorine is lost to the sunlight? A chemcial reaction? If so, what?
And second question:
If my CYA is at 50, is the only other possible explanation for chlorine loss that organics in the pool (algae or other) are consuming it in a chemical reaction?
And third (and follow-up) question:
If organics are consuming chlorine in a chemical reaction, would I necessarily see the results of this in the form of some kind of precipitate on the bottom of the pool? Is there any way that large amounts of chlorine would be consumed, but there would be no evidence of precipitate on the bottom of the pool when the water is clear?
Thank you in advance for shedding light on this whole subject!