Okay, got it.

I'm actually trying to run the pool with very low CYA (about 10ppm) so I can also run relatively low chlorine - 2-3ppm per the OTO kit. I have the pump (with auto-chlorinator) set on a timer so it's adding chlorine during the day. So far it looks like it holds the chlorine level constant both day and night - I'm testing AM and PM to set the chlorinator. I'd like to find NONstabilized trichlor pucks but so far no luck.

Thanks Everyone!

TW