Thank you, PoolDoc. I didn't see this reply before posting mine. I will lower the ph. There is not and hasn't ever been any algae as far as I know. The pool is approx 8000 gal according to my pool service company. I did not measure the depth and length, I just estimated. I will get an actual measurement and update it.

It doesn't sound like you are concerned about my high cya number. I understand that having a high cya means keeping lots of chlorine in the pool. I'd like to have my pool water be as healthy as possible for my kids to swim in. Wouldn't using less chlorine achieve that? What do you recommend? Thank you.