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Mech33

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  1. Thanks for the quick reply, I'll give the surfactant a shot! What are your thoughts on s salt water based system to try and address such issues? Then I would have constant chlorine generation with some outgassing, and presumably the slight salt cockney ration would inhibit some growth of mold?
  2. I've been using the Bromine method for about a year now on a brand new tub. The bromine has been great at keeping the water crystal clear at all times. But for the last 6 months or so, I have been battling a growing blackish-greenish mold problem. It started on the cover, but then spread to the edges of the control knobs and under the filter cover, to virtually all the inside exposed edges of the tub. But the water is still clear. I then used a strong mix of chlorine and water and decontaminated all the surfaces. The mold quickly turned light brown and easily washed away with a pressure washer with no trace. All was well for a few weeks, at which point the spots started coming back on the cover, followed by the control knobs. So again I repeated the cleaning procedure, and again it looks clear for about 2 weeks at which point it slowly starts coming back. This is not a battle I want to try and maintain indefinitely... Is a few steady ppm of bromine insufficient to keep enough sanitizer up on the exposed tub areas? Should I switch to a chlorine method, assuming chlorine evaporates faster and will cost more of the inside surfaces and sanitize them more thoroughly on an ongoing basis? I currently only use the tub every few weeks. I check the levels weekly, swapping in additional bromine tabs, adjusting pH (it's usually a little low each week), and dump on MPS shock (weekly even when I don't use it, and after every use when I do). Spa is 400 gallons and has a UV system (clear ray), but no ozone and no mineral system. I am honestly at my wit's end with this issue, so any help or insight from the experts would be greatly appreciated! Thanks in advance.
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