thank you you very much if u could give me some pics of the add oans liek the timers and the ppm meter that would be koolYou need a satndard co2 tank like welders use or scuba divers or co2 tanks for fountain machines. A good 20lb tank or bigger. You then need a flow valve and a electric solenoid to time release the injections. You then need hose and a timer digital that will allow you to do 1 minute intervals at least 10 times a day.Then you need a co2 air ppm meter or controller so you can measure co2 levels as ytou need them to stay between 1200-1500 ppms during lights on. Temps need to be 80-85 F in the grow room. You have to then counter time your air intake and exhaust so that the air in the room exchanges 5 minutes before a fresh co2 fill then the vents have to close so dampers can do that and these will be on timers with the fans.An electronic co2 monitor/controller will cost about$200 used and $600 new and it can be set to read the ppm levels and automatically inject to keep 1500 ppm automatically.This is the basics you need. Go to ebay search co2 injection or co2 hydroponics and it will show most of the stuff.Then fill your co2 tank once a month for about $20 a fill use from start to harvest with lights on