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Re: Co2 cylinders

At 03:48 AM 3/2/98 -0500, you wrote:
>Aquatic Plants Digest      Monday, March 2 1998      Volume 03 : Number 116
>Date: Sun, 01 Mar 1998 22:50:04 -0500
>From: Bjorn Straube <straube at digital_net>
>Subject: Re: Co2 cylinders

>Something to keep in mind is that most privately owned gas
>bottles have a one year hydro on them. 


> So while the fire dept may
>be cheaper per refill, it does not have a built in hydro
>($15 locally).

Can you please describe what is a "one year hydro?"  

Although I get my CO2 in replacement tanks from the local welding shop, CO2
refills are done by beer joints and at some aquarium shops.

I would be interested in the proper procedure for refilling CO2 tanks.
Anyone know?