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CO2 off at night, DIY

At 03:48 AM 5/23/99 -0400, Cliff L asked:
>>So is it advisable to cut off CO2 injection at night? 

I wouldn't say that.  There are lots of people who wouldn't say that.  See
my web page below.

>What's the cheapest
>gizmo that would do this automatically on a DIY system? 

A timer plus a left-over power supply from something plus a solenoid for
$4.50.  Ask me offline more about the solenoid.

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com