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Re: Aquatic Plants Digest V3 #117

>bottles have a one year hydro on them

I work in the "gas" business, and I don't know of a one year hydro.  
There are disposable or fill one time cylinders, such as a "medical e 
size" cylinder, but any DOT cylinder that I am aware of that is used for 
CO2 has more than a one year hydro test requirement, typically they are 
10 if memory serves me.


Also single stage regulators are fine for CO2 since it is a liquid fill 
and maintains constant pressure until all of the liquid is vaporized (for 
the flow rates we are talking about).