CO2 troubles....

I am trying to get my room up to 1500ppm. I have a hydrofarm regulator and 20 lb tank. HF's website says to turn on in am for 2 1/2hrs to achieve desired level and then go 15 on 15 off the rest of the daylight hours. This keeps it in the optimum zone as much as possible. They say to do this at a rate of .2 cubic feet every 15 mins. (for my size grow) Thats obviously .8 cf/h. Can any one tell me what PSI i need to be at on my flow valve to obtain my desired level? Thanks.

never mind, i don't know how to delete a thread. i have no interest in the grow that this is still set up at, my potna doesn't fill the tank so i guess flow doesn't matter much. Next site is all me and getting a controller.

heres a tip let ur temperature go up to 85 and make sure you dont run the co2 for at least an hour after lights turn on

there is a co2 calculator in the sticky in indoor growing, you just put in your room size and what setting you want your regulator and it will tell you how long to run.