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>Date: Mon, 17 May 1999 10:03:14 -0400
>From: "Dinyar Lalkaka" <lalkaka at concentric_net>


>I'm building my first home-made yeast CO2 injector, and have a couple of
>questions that I'd appreciate your advice on:
>1) Does the bottle have to be above the aquarium?

No.  I keep mine under the aquarium.

>2) Would a check valve help if it were to be paced below the aquarium?

Yes.  See my web site for more.

>3) Should the bottle be placed upright or on its side?

Upright, else the liquid would run out instead of the CO2 gas.

>4) I'm planning to vent the CO2 into the intake of a Fluval 403 canister
>filter. What is the best way to do this? E.g., stuff the airline tubing
>directly into the side of the intake, add a disposable air stone and let 
>the CO2 bubble up into the intake from below?

It's better to add an airstone.  That will help break up the bubbles which 
will help the CO2 dissolve better.  You should clean the airstone 
occasionally though, it tends to gum up.


Hoa G. Nguyen
Freshwater Planted Aquarium:  http://www.geocities.com/Heartland/Hills/2637/