After reading this, I fear I might be living in the twilight zone... Let me explain - last month I decontaminated our spa (hasn't had water since 2004) and filled it. I shocked using non-chlorine shock and then dropped the floater in the spa with bromine tabs. The spa is 425 gal. acrylic (above ground). We've kept the water around 90-95 degrees (the past couple of days in AZ it's been a "cool tub" in lieu of a hot tub), and I have been testing the water every couple of days. I did not establish a bromine "bank" but every time I test (I use a new Taylor simple OTO kit to test total bromine) I am reading 10 ppm (possibly more) total bromine. ph and alk are fine - haven't moved in the couple weeks that it has had water. The tub has been used daily by my daughter and wife. How could the bromine levels be so high without establishing a bank or crushing bromine tabs into the water? I haven't added more tabs to the floater and they still appear to be fairly good-sized, so I doubt they are dissolving too quickly. Very confused - anyone know what could be going on here? Thanks!
EDIT: I suppose I should add that I cover the tub each night with a hard cover to help with evaporation and the tub is indoors. Not sure if that makes a difference or not. I should also mention that the water is clear, no foaming issues, and no overpowering smell issues, either.