Quote Originally Posted by Water_man View Post
(my current CYA reading at opening is 56) and suppose I don't have algae, do I still need to shock on a weekly basis? Is the need to shock determined by the level of CC? If yes, what's the upper limit of CC ?
How are you testing? Most CYA tests do not have the resolution to give a reading like 56 ppm. Even the $1000 colorimeter/turbidity meter we use at work is +10/-25 ppm for the CYA test.