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See #15 in the CO2 section at The Planted Tank FAQ


It will answer the question about the first two.

The third one it won't but chances are it will not work. If the normal operating pressure of the fire extinguisher is 125-150 psi then it won't. And the type of FE you linked to is almost alway a pressurized dry chemical type. Those are welded tanks.

A CO2 cylinder must be mounted vertically. You can't allow liquid CO2 into the regulator.
 

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Often, fire extinguisher shops retrofit old extinguishers as CO2 tanks. That's how mine are.

Price can be variable. Where I'm from you will pay at least $85. CO2 refills are also $19. Ridiculous, I know.
 
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