Quote Originally Posted by waterbear
When you closed the pool was your CYA level higher than the 30 ppm you tested now? If so it is possible that some of your CYA biodegraded. This would cause a huge chlorine demand since the bacteria will excrete ammonia compounds and urea.
I know that the CYA was arount 40 when the pool was closed last year. The bill from my dealer has 4# of "conditioner" So I assume that they put CYA in also. So my best guess is that there wasn't much left at open.

If this is the case, how much chlorine would a guy need to put in to overcome, and still not damage the liner?

THANKS!