ed3120 Posted July 6, 2012 Report Share Posted July 6, 2012 The bromine level in my spa (360 gallon) has been weird lately. About a week and a half ago, my bromine was over 10 ppm. I have a Spa Frog system, so I turned the Spa frog down to 0 so that it doesn’t introduce any more bromine. I waited a few days with the tub opened a few hours per day and eventually got the bromine level down to 0. I left it at zero for 2 more days, and the tub naturally started to turn from clear to green. (Which proves that the bromine level was 0.) Yesterday, I turned my Spa Frog to 1, which is the lowest setting that isn’t off. I also put in 2oz of Fresh N’ Clear shock. Today, I woke up and tested the water and it was up to 5ppm of bromine (that’s as high as my test strip goes). My alkalinity is a little high (160), but my pH was close to 7.6 when I tested it 2 days ago. What could be happening? Quote Link to comment Share on other sites More sharing options...
DaveH24 Posted July 6, 2012 Report Share Posted July 6, 2012 I'm not even sure what the spa frog is, But the shock will have converted the Sodium Bromide reserve back to bromine , which is what you are testing for. Read Waterbear's "Bromine for Beginners" for more details http://www.poolspaforum.com/forum/index.php?showtopic=30249 Quote Link to comment Share on other sites More sharing options...
ed3120 Posted July 7, 2012 Author Report Share Posted July 7, 2012 Spa Frog is a cartridge-based bromine and minerals system that is built into some tubs. The shock that I use is MPS. So it can raise my bromine level? I asked the guy at the spa store the other day and he told me that it couldn't. Quote Link to comment Share on other sites More sharing options...
chem geek Posted July 7, 2012 Report Share Posted July 7, 2012 He was incorrect. MPS is an oxidizer and converts bromide to bromine. Chlorine also does that as does ozone (though ozone also converts a portion of bromine to bromate). The MPS may oxidize some other bather waste faster than it oxidizes bromide, but if there's any MPS leftover it will oxidize bromide to bromine. Within some number of hours, you won't have any MPS left in a bromine spa -- you'll have a higher bromine level instead. If you use chlorine instead of MPS, you will accomplish the same thing of producing more bromine and if you use bleach to do this then it will be at a far lower cost. Quote Link to comment Share on other sites More sharing options...
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