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 ?
If you haven't checked out "pool school" on the upper right corner of the screen (your right, not the screens). Check it out. some absolutely great info in there.
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