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Re: Aquatic Plants Digest V3 #813

Hi to everyone,
     I read with interest about the issue of CO2 escaping into the
atmosphere when using the  ceramic disc type of diffuser. I believe that if
you position your diffuser near to the substrate, the CO2 will take longer
to reach the surface of the water,thus allowing the fine CO2 bubbles more
time to react with the water, no doubt there will still be bubbles reaching
the surface of the water,but I think the content will not be CO2 already.
Anyway, has anybody ever check  the concentration of CO2 of the bubble when
they reach the surface of the water .

##   It is going to be Chinese Lunar New Year  ##

> Date: Fri, 29 Jan 1999 10:51:12 -0600
> From: "Beard, Kelly" <KBeard at comdata_com>
> Subject: A Better CO2 reactor
> I've got an Eheim diffuser.  It's okay, but a lot of those little bubbles
> make it to the surface, so that's wasted CO2.


I keep hearing this (and about surface turbulence, etc.) losing CO2. For
the life of me, I don't understand the logic behind this thinking.

When I inject CO2, I just use fine airstones, and let some of the
bubbles reach the surface. If your tank is properly covered, the heavier
CO2 just accumulates inside the hood and gets dissolved into the water
from there. Surface agitation or motion just *helps*. CO2 is *really*
soluble in water. Very little is lost.

I wouldn't even try to inject CO2 into an open-topped tank, so maybe
that's what I am missing.