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Once the water leaves the injector, or "mixing" chamber for that matter, the little bubbles of ozone quickly rise to the top of the pipe, leaving a pocket of air in the top of the pipe............ kinda like the pocket of air above the water of a spa and beneath the cover
A longer pipe gives you.................................. just a longer pocket of ozonated air sitting on top of a longer pipe full of water.
So would you agree that a second mixing chamber like the one found in a D-1(and other brands, I just know the D-1 sys better) would be beneficial?
One thing about the UV and Corona discharge...Marquis does use a UV....but unlike I think most or perhaps even all UV types....It uses a Plasma cell instead of a ballast...it is the ballast that fails and with each use produces less and less ozone....by using the Plasma cell they have found that it puts out the same amount ozone from day one to day 2000 ( about 7 years ) in their testing....and requires no maintenance
Well, just so you know: HotSpring uses the plasma type generator, that's the one which lasts about ten years and needs no care..
Finally, I have learned by first-hand experience that some people can tell when their ozone system is suddenly disconnected or stops operating, and that tells me that most folks can tell a difference. How? Perhaps they smell it, perhaps they notice needing more chlorine than usual, or perhaps the thing goes completely cloudy on them and they check into it.
What is that second mixing chamber? Another injector? Some more pipe? a...?
The Generator is the electric/electronic item which produces the ozone. There are a few types in common use: Ultra Violet (or UV), CD and Plasma. The UV has a light bulb which does the work, and only lasts about two or three years. It may still light up, but should be replaced at that time. .
"is there a benefit achieved from the ozone's contact with the surface of the moving water in the pipe?"Yes, but it's SO small it's unmeasurable...... so it might as well be "no"
"I am still a little unclear as to how the ozone becomes aqueous"Just like any gas, under the right aonditimns it's absorbed into the liquid. Kinda like oxygen into water so fish can survive.