1200 min, 1500 max imo.
do you have something that can measure co2? ideally you need a regulator and a controller.
start at flower as he said, some people say it causes stretch so you can wait 1-2 weeks in if stretch will be a problem (more vigorous growth for sure).
when you guys use CO2, do you then have to exhaust it outside ?
True, Co2 will push out air.CO2 does displace Oxygen though fellas, Once your passed out there aint no coming back......
running a sealed room for 5 yrs, never exhausted. Also going over 1500ppms is pointlessHey Chuck, this really clears up the open room concept and the sealed concept. thanks for posting this.