How Do I Dispose Of a Used Propane Tank?

Propane tanks come is all sizes from a small 2lb tank for a small grill or heater to a large 1,000 gallon
tank for commercial or industrial use.

Strangely, a 57 lb tank holds 46 lbs of propane, a 120 lb tank holds 96 lbs of propane, a 500 lb tank holds 400 lbs of propane, and a 1,000 gallon tank holds 800 lbs of propane.