I opened a 192 gallon spa last week, and started on the 3-step process. I shocked the new fill, then added appropriate amount of sodium bromide to establish a reserve. The shock (bleach) raised the free chlorine appropriately, but the Bromine tabs I'd ordered didn't arrive until today.
Since it's been a week, should I add more sodium bromide, or is there a way to test if there's anything left in the reserve? I did a half-shock again, as the FC was gone after using it last night. And now I have 2 tabs in the floater.