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Originally Posted by Bob_I
To begin with running bubbles through water does not add oxygen to the water. Gas exchange only happens at the water surface in a very thin layer where water meets the air.
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Bob you just contradicted your self. around every bubble is a water surface where gas exchange can take place. the reason a skimmer works very good in adding O2 to the water is 2 fold, 1 it creates a large disturbance which aids in driving off C02 and 2, it creats a extreamly large surface area (all the surfaces around the bubbles) to adsorbe the O2.
now if you want to compare the efficiencey of large bubbles to small bubbles the smaller ones win hands down thats why the old bubbling treasure chests we used to keep in our tanks were pour at adding O2 to the water.. they only did 1 large bubble every few seconds.
Steve
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