Before I built my pool/spa I had a 10'x10' portable spa (480 gal) that I ran year round (S. FL) on chlorine for the first two years and then switched to bromine for the next 4 so I have some experiece. As DavidD stated you need to have a "bromine reserve" in the water and then activate it by shocking. You can use a monopersulfate shock to do so or you can use bleach since chlorine will also activate the bromine. The spa dealer that I got my spa from is the one who origially told me to use bleach to shock it. That would usually get my bromine to proper levels (around 6ppm). I had also used monopersulfate shock at times becuause, supposedly, you only need to wait about 15 minutes before going in. He told me to put about 8 oz of regular (5.25%) bleach in for each 300 gal of water and then wait for about 1 hour before going in. Many (possibly all, not sure of that) of the bromine tablets on the market that are meant to be used in 'floaters' actually have chlorine in them to activate the bromine. The main reason I switched from chlorine to bromine was that I was having a hard time keeping a proper FC level in the spa and was having some algae problems, probably due to the high temp and the fact that the dealer had me using bleach but did not tell me about using CYA! (the spa was outdoors and I tended to leave the hard cover off for days at a time becuase it was a 2 person job to put it back on) This is before I found this site. If I knew then what I know now I probably would have stayed with chlorine. I did find that once I switched to bromine it was harder for some reason to control my ALK and pH...don't know if it was the bromine or not but suspect it was. My current pool/spa is on chlorine with a swg and I have had no problems. Bromine is more costly than chlorine and, IMHO, for an outdoor pool is not my first choice for a sanitizer. For an indoor pool or heated spa it MIGHT have some advantages but also has disadvantages.
Last edited by waterbear; 04-11-2006 at 11:13 AM.
Retired pool store and commercial pool maintenance guy.
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