I have a new in ground pool. Just hooked up the filter with a small amount of brown algae present on the bottom of the pool. the water was crystal clear with filter and salt generator working. PH 7.6, calcium 250 alkalinity 150 free chlorine .99 and total chlorine 1.07. The pool is 36,000 gallons. I added 4 pounds of shock disolved in water. When I poured the disolved chlorine in to the pool it instantly produced white clouds in the pool and my clear water is now milky. I ran the filter for a day with little to no change. The algae looks to be resolving but I don't know what I did wrong and how I need to fix it. HELP Please.