I didn't see any posts related to my topic so just have a quick question. Had a service open our pool yesterday. We have a loop loc mesh safety cover so some debris has collected at the bottom while it was closed. They added what looked like a gallon of liquid chlorine and he recommended waiting until the water was clear and we could see to the bottom...then power vacuuming 1/3 of the pool debris (leaves and algea on bottom etc.), then shocking again and power vacuuming another 1/3, shocking one last time and removing the last 1/3 of debris. I'm new to pool openings so was wondering why one wouldn't power vac all of the debris out at once. Isn't the point to get the organic matter out of the water? The pool is pretty big 40k gallon L-shape. And my last important question...should we be following the "Pool School" instructions for shocking the water now or wait until all the debris is cleaned out? Thanks in advance for your help.