Thanks! I'll buy some tomorrow. I visited a pool & spa store today and must not have described this stuff well enough bcz the salesman sold me more "Bro Go" -like stuff, so I added another packet of that. Further, I spoke with the dealer again and he said to add more bromine tabs, which I also did.... so far, I still have a zilch bromine reading, but, happily, my water is crystal clear (but I will still pick up the brominating concentrate - too many days with a bad reading...).
Thanks!
Nancy