Ok, I've been doing BBB since about the second week in July.
Overall, I have been very pleased with the results, though I have cursed it a few times when I needed to add bleach at 8:00 PM and was completely out of it.
Anyway, I am using test strips to test my water, because budget did not allow for a good test kit this year. When I started BBB, my CYA levels were testing at 35. Since I thought CYA doesn't evaporate, I pretty much ignored the CYA on my strip and just checked free chlorine, ph and hardness.
Last night, I decided to check all 4 tests, and my strips say the CYA level is 0. How is that possible? It's mid-August now, and the pool will be closed the weekend after Labor Day, so I really don't feel like buying CYA this late into the swimming season.
I know I should probably buy a good test kit, or take the water into a store to have it tested.
But I am curious. How can one lose CYA?