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Thanks, Allen. That makes sense. I was hoping they could bind it to something that would not hurt the pool water but apparently not. I appreciate the explanation.

Nice :) I imagine so many people would buy the equivelent of Trichlor without CYA. I am just wondering if there is something in the manufacturing process that requires them adding CYA, else I would imagine they would have an alternative product for those who do not want to add it.

I live in sunny hot Phoenix and this is my first year with a pool, it was finished in May. I use Trichlor to chlorinate it and when I did my first CYA test a couple of months ago it was over 100. I diluted the water for over 24 hours (filling and draining at the same time) bringing it to 50...