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good stuff here. just a short note for bromine users on this topic -- with an ozone generator of sufficient output, one can do pretty well with just leaving bromide salts in the water and shocking before you leave town. i've gone two weeks with this method -- my plan consisted of1. you get a small amount of bromine conversion just from the ozone, if sufficient bromide salts are present. 2. when you shock to 20ppm or so FC equivalent, (1) above produces a very nice, slow decay of sanitizer. I've measured less than 20% in my spa, and when the levels get really low, the decay rate turns very asymptotic because ozone generator will do a pretty good job of keeping up with "no load". of course, if you get some contaminant in there (like a spider or bee or dust from a wind storm...) then it won't keep up.. 3. if you dose with a small amount of ahh-some, this will also help the sanitizer demand. yes I've tried it. that stuff has been tested to kill biofilms outright -- though not as a replacement for CL by any means, but it has a verified kill rate.