co2 noob ( using an old soda stream drinks compressor)

so my rents had a fizzy drinks maker... called a soda stream and i've put it in my grow room which is 2ft by 3 foot by 5 foot tall. i set the soda stream off for about 30 seconds in the morning which seams to do ok but i gotta hold the button in to get the bastard thing to go off. so my question is, how long do i hold the thing on for? how much co2 (in fractions please) do i need to fill up my room? and is it even worth it if my grow room isn't air tight? pluss if anyone know's of a valve that would open a small co2 tank same sort of size as a pant ball gun's tank. or even where to get a valve that'd be great!

Honestly your probably not gonna see much difference by doing it like that.. If you wanna use co2 (which I highly recommend) then you might wanna think about investing in a co2 injection system, or doing the diy co2 systems. I have personally never used them but alot of people swear by it

https://www.rollitup.org/general-marijuana-growing/258474-home-made-co2-guide.html

cool diy max!!