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I believe it's 50 ppm as boron, so that would be 286 ppm boric acid. More info in this AQUA magazine article.

I'm thinking of trying to run bromine sanitizer using my SmarterSpa SWG with 1500ppm NaCl + 50ppm NaBr. I expect that the SWG in this setup will primarily produce chlorine, which will quickly react with bromide ions to produce HOBr, the intended active species. I didn't see any posts describing...