Any time you use your fire extinguisher, it will need to be refilled or recharged before you can use it again. Fire extinguishers also need to be recharged occasionally as part of their regular maintenance routine. It’s best to have your extinguisher refilled and serviced by a trained fire safety professional. In some places, you need a formal fire department certification in order to legally service a portable fire extinguisher. If you do choose to refill your own fire extinguisher, follow the guidelines set out in your owner’s manual very carefully in order to ensure your extinguisher functions safely. You’ll need the right kind of chemical extinguishing agent as well as access to pressurizing equipment. You’ll also need to inspect your extinguisher carefully for any signs of damage.