19 Isn't Carbon Dioxide (CO2) expensive?
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This article is from the Aquaria: Plants FAQ, by multiple authors.
19 Isn't Carbon Dioxide (CO2) expensive?
The startup cost can be a bit steep; expect to pay around $500 for a
fully-automated Dupla system, $350 for a manual injector. If you do it
yourself using welding or bar supplies, you can drop the price to
$100-$200 for a tank, regulator, and needle valve. After your initial
investment, CO2 refills (try fire extinguisher or beverage service
outlets) are cheap: $5-10 a year for a 5 lb cylinder.
If this is still too much, try the ultra-cheap Yeast Method of brewing
CO2 (see below).
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