Quote Originally Posted by smallpooldad View Post
pH of 7.3 ok
Alk 120 ok
FC 5 ok
CYA 60 ( too high go to 45 by draining down the pool 25%. This should keep you algae free but if you are not getting algae at a CyA of 60 it is your choice)
Don't waste your time draining your pool! I hate to say it, but SmallPoolDad is wrong on this one.

There's nothing wrong with a CYA of 60. You'll have to keep your regular FC in the 5-10ppm range , but that's fine. IF you keep it there, you'll use less chlorine this summer as it's been a real chlorine eater all around! If you keep it in that range you won't get algae.

Our "Best Guess" table is still a great way to stay safe and compensate for higher levels of CYA. aylad, one of my fellow monitors, NEVER runs her pool below a CYA of 60--she lives in Louisiana where it's hot and sunny and the chlorine disappears if you blink at "normal" CYA levels. So she runs a higher CYA, a higher normal residual level, and doesn't go through barrels of bleach keeping her pool clean.

Using the "Best Guess" table give you the correct equalibrium between CYA and chlorine residual levels.