[Aquattro]

Tony, I don't know what rental costs are, but unless they're dirt cheap, it is more cost effective to OWN the tank. Also, if you rent and they just replace the tank with gas in it, you have no idea what was in the tank they give you. Maybe it was under water or had oil in it. In Victoria, I could probably find a tank a week for sale. Hydroponics, brewing, welding and fire extinguisher companies all deal with CO2 tanks.If you go to a place here to rent one for your tank, they ask why you don't just buy your own!! Saves money in the long run and you don't keep getting some rusty old tank with who knows what in it.