how to introduce co2 in a tent with positive vacume of scrubbers running?

hellraizer30

Rebel From The North
so im wondering how to introduce co2 to my tents! simple well no so, im venting through scrubbers 24/7
and thats not going to allow the ppms to build up
so that leads me to how? can I make this posable.
a idea I had was to put my scrubber fans on a timmer a couple times a day to shut them off and give
the girls a blast of co2! now is this worth doing? is short blasts of co2 going to be something worth doing?
and if so how many time during lights on do I blast them?
 
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