Chlorine / CYA Chart

pwrstrk

LifeTime Supporter
TFP Expert
Aug 18, 2012
4,758
2
Elverson Pa.
#2
Shock is the FC level that will kill algae. If you have algae that's the FC level that needs to be maintained to kill the algae bloom.
Here is the process you'll have to use if you have an algae bloom to kill it off.
SLAM Process 😎
 

Kiss4aFrog

LifeTime Supporter
TFP Guide
May 22, 2013
2,723
0
Hudson, WI
#5
If your CYA is 40 they you are correct in trying to maintain the FC at 5 and you need to never let it drop below 3 to maintain clean and clear water.