Ok, the manual for my Aquarite says CYA 80 and FC 1-3.

The best guess chart says FC 5-20 with the CYA that high.

I've gone 1 season with the Aquarite recommendation and the other with the best guess chart. I didn't have problems either way, but wondering why the big difference and what everyone else is using?

33k, vinyl pool.

thanks!