A week ago I drained my hot tub. I did the whole decontamination method. Cleaned out the pipes, drained, superchlorinated, drained, re-filled and did the 3 step bromine method. My water looked better than ever and my bromine levels were more stable than ever before.
Last night I had a bunch of people in my hot tub and this morning when I tested the water the bromine level was 0. I decided to really give it a good shocking so I added about 12 ounces of 6% bleach then left it covered. I tested it about 7 hours later hoping it would be under 10 so I could use it, and found the bromine level to be at 1.5. This really surprised me as I just dumped in a lot of bleach.
I just added another 8 ounces of bleach and I'm going to go test it in a couple hours, but I have a couple questions.
The bromine levels likely sat at 0 overnight after everyone got out. Does this mean I now have a little bug growing in my hot tub that is eating up all my bromine? If so, can I kill it by continuing to shock until the levels stabilize again? Or is it more likely there was just so much sweat/oils/urine etc. (I hope no urine, but you just never know when people are drinking) that the chlorine I dumped in initially had to kill all that which is why it got used up so quickly? The water was cloudy but seems to be mostly clear again. I don't have to drain and re-fill again do I?
I know the problems with leaving bromine levels at 0 for any period of time, but when you get out very late at night and you've been drinking, you don't always think responsibly.