I'm probably a little to late for this, but here is how CYA was once explained to me...
CYA is like sunscreen. If the number is too low, you will burn. If the number is too high, you will never get a base tan.
since sun 'eats' bleach, CYA is like sunscreen for your pool. if the number is too low, the sun will 'eat' all the bleach,
but if you have too much CYA, then the bleach can't work properly to do it's job.
Since I went to pool school, I finally understand that CYA is many times to blame for a pool that has gotten out of control.
CYA is like sunscreen. If the number is too low, you will burn. If the number is too high, you will never get a base tan.
since sun 'eats' bleach, CYA is like sunscreen for your pool. if the number is too low, the sun will 'eat' all the bleach,
but if you have too much CYA, then the bleach can't work properly to do it's job.
Since I went to pool school, I finally understand that CYA is many times to blame for a pool that has gotten out of control.