Hello! I have a new ~5,000 gallon AGP that is just about full to midway up skimmer. The pool installer said to add the shock bag that came with the pool equipment and then take water sample to store Monday. He also said we could swim 2 hrs after putting the shock in, which should be added thru the skimmer. Before I do anything I want to see if this is appropriate and if there is a better way to start out. I actually have the tf-100 test kit recommenced on this site. I have no other chemicals yet and plan to go this morning to buy some. Any guidance someone could give would be helpful for starting out today. I have begun reading the pool school information on the site, but feel a bit overwhelmed and confused on best way to start chemicals. Thanks!