dlleno Posted June 29, 2016 Report Share Posted June 29, 2016 just a footnote on this procedure from my experience in a bromine spa with ozone: the decay rate is NOT linear. if it is, then you have bad guys growing. for healthy water, a good bromide bank and a strong, corona-discharge ozone generator, the sanitizer decay rate asymptotically approaches some very small non-zero number over some long period of time. I have personally measured decay rates of 10%, which implies a very long time before you can use the tub if you start at 10ppm FC equivalent! My ozone generator runs continuously (I can't shut it off), so I'm very careful not to shock with anything, including MPS (which also produces bromine). Happily, if the water is that healthy then it doesn't need to be shocked :-) My tub runs at about .5ppm continuously sustainable residual, with no bather load and healthy water - a very nice bonus for vacations and such. the only caveat is that with an outdoor tub, there are alot of things that can upset the perfection, such as a stray critter, some organic matter from nearby trees, or even a wind that kicks up some dust that gets through the crannies of your cover. so in an odd twist, the consequences of very healthy water in a bromine spa with ozone is that you have to watch that upper limit very carefully! Quote Link to comment Share on other sites More sharing options...
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