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Anytime a bromine spa gets a bit cloudy the best thing to do is to add some dichlor. That seems strange to some who think "but we're using bromine, not dichlor" but in reality about 25% of those tablets are chlorine and adding some dichlor to will clear things up usually.
Shock with your cover OFF for at least 15 min. and by tonite your water should clear up.
The bromine tablets have chlorine in them but the chlorine will be coverted to bromine.
It's been a long time since I studied the chemistry of bromine and chlorine, but I don't remember anything that would cause chlorine to convert to bromine in a hot-tub (unless you are passing an electical current through the water ). Could you please explain how that works? Thanks.
Are you using Arctic's products?Peak Boost is Sodium Bromide. That establishes the reserve. If you shock with Refresh (MPS) and you have sufficient reserve whether through Peak Boost or the tablets, you should get an immediate Bromine reading. If you do not, you don't have enough reserve and need to add some Peak Boost or equivalent.
Watch your Bromine levels. If you shock the heck out of it and have a good reserve, you're Bromine levels will go off the charts and could take a day or two to recover to the point where the water will feel "good" again.
With Bromine, if the water gets cloudy, you can shock with MPS and provided you get a decent Bromine reading, your water will clear. If you don't have Dichlor, you don't have to buy it, but it won't hurt your spa or Bromine system either to use it.