Dispose of it safely
Some retail locations such as grocery stores or gas stations will accept old compressed gas tanks for recycling and give you a credit towards the purchase of a new tank.
You can also visit www.recyclinghotline.ca
for a list of private recyclers, or contact 311 for advice on proper disposal.
Compressed gas (including air) tanks are not accepted in black carts, blue carts or at community recycling depots.
Contact 311 for advice on disposal of commercial quantities of gas tanks and cylinders.