I didn't bother with any chlorine for my pre-plaster swamp. I just let it fester. I had tons of interested dragonflies to keep the mosquitos at bay.
Why? and on what?
Kim
It cannot hurt. It might even be a good idea to make a point of doing a "treatment every season or so to be on the safe side. I did not even think of how close the wet is to your house.
Kim
Wow that looks great! What is the dividing line for?
5 days is insane for coping on a pool that size.