I have kept the Cl at 15 ppm, since Monday. Today the level of Cl went down to 0, my husband added more bleach this morning and it's back up to 5 so I am adding more bleach now. So far, thanks to everyone, I can see the ladder and the skimmer pole on the bottom that one of the kids dropped in and lost. Hurrah! Progress.
Thanks to everyone on the board for the help that is available.