please help co2 tank set up

[tyler_ hobbyist]

I have always used the old fashion way of co2 and I want to upgrade to co2 tanks I bought this regulator and I'm gunna buy a tank. Does anyone have exsperince with this kinda set up? I'm not buying a co2 controller I dnt have the money for one. How do I set my regulator for 1500ppm in my space does anyone know the calculation for this?

 

[South Sierra Dude]

Grams/mol and good luck; this is not really in the spirit of easy.

 

[tyler_ hobbyist]

How do I know what psi to set the regulator to how long do I set the timer.

 

[tyler_ hobbyist]

10x10x7 or 700cubic feet of space