I bought a used hot tub from my neighbor and filled it up last week. She said it had an automatic bromine dispenser called a "frog" that would bring the chemical mix up to normal in a few days.

It's 5 days later and tests as having very, very minimal bromine. I'd like to use it, so I put in a half a cup (per the directions) of non-chlorine shock. Specifically, it is potassium peroxymonosulfate.

Supposedly, I can use the spa within 15 minutes after adding it, but that's for safety's sake. What I want to know is, am I risking getting some kind of infection by taking a hot soak in this thing if I got in it tonight? Or, should I just go ahead and put in a full 'recipe' of bromine chemical mix so that I can use it tomorrow? I can do that regardless of course, but I'd like to take a soak tonight if possible. It's a beautiful evening, I have the time, and it's been a long week.

Anybody have any ideas on this? I've swam and fished some nasty rivers, but still...
Well, never mind. It's been half an hour, so I used a test strip. I guess there was PLENTY of bromine because whereas before it tested as none, now it's a square past optimal on the test strip. The other readings are fine too. Guess I'll have myself a nice hot soak on a cool spring night. Thanks if anyone answers.