Hi, Scott,

I'm with Kurt....you've got a great handle on understanding your pool chemistry...wish I had learned that fast.

If you do 25% refills, it will take 7 of them to get your CYA below 50. If you can tolerate a 50% refill, you can do it in three.

I also assume that TDA is TDS (total dissolved solids) and that's a little high as well. Drain and refill will sove both issues.

You're off to a great start...enjoy your pool!

Dave S.