Jim
Confused about the dial.. Are you talking about that last unit you posted from Enlay with the Dial as mine doesn't have a dial.
I got the idea you might be thinkin' of getting that unit for the big tank
You will be fine with the unit you have with no dial, just remember you are still almost twice max dosage.
Steve
Copper, yes that is what is in brass and when it gets oxidized that is the color of the liquid or tarnish one would get on/from the metal
NSW has about 65 ppm bromide. There are two kinds of bleach more or less. "Chlorine Bleach and Bromine Bleach" You never hear much about Bromine Bleach except in the swimming pool industry, where it is used instead of regular Chlorine Bleach (house bleach, stuff wife uses on cloths and many water supply companies put in their water.) Bromine Bleach is the same except it uses Bromine instead of Chorine. The Bromine kind is sometimes used in swimming pools as it lasts longer and produces no/little gas like Chlorine.
In seawater the ozone attacks the Bromide ion and produces Bromine Bleach, which is quite toxic to aquatic life, obviously if it is used in swimming pools.
O3 + Br- -----> O2 + OBr-
Technically this OBr- is called Hypobromite, just like tech. house bleach is hypochlorite
The reaction above can have something else happen, which as far as toxicity is better for us but as far as oxidation reactions is bad for us. It goes right back to Bromide
O3 + OBr- ---->2O2 + Br-
However, we never know where we are at in these reactions, so we need to play it safe. If you check the water effluent of a skimmer with ozone with a common Chlorine test kit it will show +. That + is for Bromine and not Chlorine as both use the same test procedures most of the time. I always tell people if they are worried about Bromine get a good Chlorine test kit. One that has a range of 0 - 1 ppm . Meaning .01, .02 ---.1, .5, --- 1 ppm
OK, so your next question is "how come ozone does not produced Chlorine Bleach in seawater where the Chloride ion is 19,000 ppm. You don't want to go there, it is called thermodynamic kinetics. In short ozone really likes Bromide, as in 50,000 times more it likes it