Slamming when water is cold

[Barbest]

My pool water is 55 degrees and crystal clear. When sweeping I see a small amount of algae on a couple of walls. CYA is 50. Is the chlorine level for slamming still 20 when the water is this cold?

 

[mknauss]

Yes.
The SLAM Process is slow, as is the growth of algae, at lower water temperatures.