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CO2 Question

Dear Digest Readers,

I am thinking of buying a solenoid valve to hook up with a timer so that the
CO2 will be shut off with the lights for purpose of saving the CO2. I would
like to know :

1. Is turning the CO2 on for 24 hrs. be better off 
2. Is using a PH controller a better option than hooking the solenoid valve
with a timer

Can someone shed some light on the above?


Patrick Ng
Hong Kong

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