OK, got some numbers. The chlorine level has finally come down and is around 1.5 to 3.0. I'm having a hard time pinpointing it further because I'm having a hard time seeing the color difference between the two levels. I think I need to get a more precise testing kit. pH is 7.6. The active ingredient in the shock is Sodium dichloro-s-triazinetrione. As I said above, the water is crystal clear. I mentioned it getting cloudy when I ran the filtering pump; I ran it all last night and the water stayed clear this time.