"Sean Dinh" wrote in message
...
I have to disagree here. Fine air bubbles can't really blows any gases out
of the water.
Gas exchange need to happen at water/air interface. What fine air bubbles
really doing
for gas exchange is to move water from the bottom to the surface. In this
pump mode, fine
air bubbles has little efficiency without the aid of ducting.

snips
As for flooming, it does work. If it's good enough for sewage treatment
plants, it's good
enough for our ponds.


Hi,
Fine bubbles or any bubbles are, in fact, a water/air interface.
Supersaturated gasses can escape using bubbles and oxygen is added to the
water. I went back to my notes and although the pump method (flooming) does
oxygenate, it does so by spreading the bottom water over 'hundreds of square
feet of surface' as it 'falls downhill'. Not everyone has hundreds of square
feet of surface or wants to run another pump. The bubble method works much
better but better yet when powered by a blower. This gives the best of both,
a large upwelling at the surface which consists of thousands of little
bubbles.
L8R -_- how
no NEWS is good