hi all, just interested in peoples views on air injection via venturi´s .
basically it is a small hole in the water return to tank pipe ,with tubing sucking air in. this air gets pushed/sucked by the waterflow .
any one use them? it seems a cheap way of oxigenating..
pro´s/ cons please!
thanks, regards
Hi mopa,
A venturi will contribute to oxygenation but, whether it's any better that just letting the water drop back into the tank, is questionable.
Most of the oxygenation in a fish tank occurs at the surface where the air meets the water......so the trick is to keep changing the water that is in contact with the air. The slight upwelling....where "stale" water is continuously brought to the surface.....has much more effect than all of the bubbles.
One of the most effective ways to stir a tank (constantly changing the water at the surface) is to use a practice that aquarists refer to as "flooming".....where you sit a small water pump on the bottom of the fish tank and let it discharge upwards. That creates the "upwelling" effect......a swelling at the surface that indicates that "new" water is making it to the surface all of the time.
Gary
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