Opened my pool the other day and used robotic cleaner to get the little amount of debris that was in to. The bottom was spotless after the cleaner was done. The water wasn't crystal clear just cloudy.
I got deal on some HTC 10% chlorine last year so I added 3 gallons yesterday to shock it assuming it would be weak from storage. I have been running the filter 24x7 for about 36 hours.
This morning the pool has patches of light brownish/green dusty patches. I fought with this all last summer thinking it was pollen or something but the air and water temp is 50 degree now with no pollen.
Here is a link to pictures:
Todays free chlorine was 12