I don't remember what i paid for my tank. I think it was about $60 or $70. I don't rent a tank I own it and just bring it in and have them refill it for me. You might want to shop around and find a place to just buy a tank outright. I don't think it would be much more $. Hope this helps.

Laterz
Sativagrowin Reviewed by Sativagrowin on . Co2 Tank Life I think I am going to be using a flow rate of about .3 cuft/hr for fifteen minutes on an hour in a 54 cuft grow space. What size tank should I purchase and importantly how long will it last. I would like it to last the whole grow hopefully. Rating: 5