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Re: [APD] DIY-ish CO2 kit?

Hi Wolf,
I used a yeast type CO2 generator (DIY) when I got into planted tanks, for about 
two weeks. They are very hard to control and nearly impossible to regulate. For the 
money, I would just build one myself  from a 2 liter soft drink container and direct the  
output into the intake of a filter. You will have the very same thing as any of the CO2 
kits sold that operate on a yeast generator. I have not used one, but the Hagen system 
looks OK, but the refills are expensive compared to purchasing your own sugar and 
brewers yeast.

Look at the yeast CO2 kits maximum size. I think they usually are good for 20-30 
gallon tanks. If your tank is larger, they say to buy additional kits. 

I just looked on ebay under "CO2 regulator", and you can buy new single stage, dual 
gauge regulators for very near the $34 figure you mentioned ($35-$40). A search 
under "CO2 tank" showed a brand new 5 lb aluminim CO2 tank from $53.95 from 
the same company selling the regulator.

Do yourself a favor: buy the regulator, pony up the extra $55 for the cylinder like you 
had before, then you are ready for CO2 injection that can go with any size tank you 
may use. When I got serious about planted tank keeping, yeast type CO2 was totally 

If you do some cost averaging, you will probably find that the Hagen system or 
something comparable and refills will equal the cost of a 5 lb tank and regulator 
in about a year or so. 

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