My friend gave me a 20 gallon bottle with the regulater and sloinoid. untill i get a timer. Can i turn the bottle on for 10 minutes a couple times a day? i have a 12ft. by 12ft room. thanks

if you're using a timer to dose CO2 you need a flow meter, otherwise you'll likely WAAAAAAAAAAAAAAAAAAAAAAAAYYYYYY overdose, or not get anywhere near, get it wrong and a squirt could bring your room up to 30,000 ppm easily.