Quote Originally Posted by Herbus
Plants need elevated co2 levels for extended periods during the daylight cycle to show marked and measurable improvment.
I believe Zandor's recepie is 1800 ppm while lights ON... the air should be exhausted and re-leveled to 1800 after a couple of hours.

CO2... my future upgrade... right after the a/c unit... and after the de-humidifier... and after the Volcano... and the new gaming computer... and the Centerforce II clutch for my car...