NUMBERS QUESTIONS for CHEM LEVELS of POOL

[Watermom]

Read the thread at the following link. It might help you understand the correlation between cya levels and chlorine levels.

http://www.poolforum.com/pf2/showthread.php?t=2260

[michladny]

I think they way I am reading it is that CYA protects chlorine (what form?) and if it keeps it from being "diluted" from the sun (and others stuff) then why do you need more for a higher CYA level....CYA is what is protecting it...right?????

[Rangeball]

Yes, CYA bonds with chlorine (any kind, chlorine is chlorine) to prevent it from being lost from UV rays, but also weakens it's sanitizing ability somewhat. That's why you need a higher FC reading the more stabilizer you have, to get you to the same sanitizing power as FC with no CYA.