Can Clorox bleach be used in place of shock and if so is there a calculation formula?

Liquid shock is 12.5% sodium hypochlorite. Clorox bleach is 5.95% sodium hypochlorite. It's the same stuff, but a lower concentration. You would have to calculate how much shock is needed for your pool and make adjustments for the concentration level. It works just as good as high priced "pool shock".

i have a 12x36 pool ..........how much Clorox do i need to make it clear? its not green ,its foggy!!

If your filter is working, and your water is balanced chemically, but still cloudy, perhaps your water has particles too small to be caught in the filter. This is what happened to me this year, after a spring season of record-breaking pollen levels. A pool service technician suggested that I add 20 lbs of alum to my 16x32 in-ground vinyl liner pool. I followed the directions on the alum bucket, and voila, my pool is crystal clear!