Quote Originally Posted by mccato
I have one more question - on the best guess CYA chart - what is the difference between FC and Shock FC? Should I aim for somewhere between min and max FC or Shock FC?
Min FC and MAX FC would be the levels at which you should maintain your pool.

Shock FC is what you need to be at to clear your pool.

But with you CYA as high as it is.........you might have a need to go above these levels.