I was worried that my fire extinguishers were too old so I called the fire department to see if they would inspect them. The fireman said they don't inspect fire extinguishers, but he said to just look at the dial and see if the arrow pointed to the green area that says "Full". He said once it is discharged it has to be serviced.
He also said that the powder inside can get crusty on top from settling. Here's what to do to prevent that: Every six months or so, turn it upside side down and back again. Rock it back and forth, you should be able to feel the powder pouring back and forth inside. If not, knock on it with a rubber mallet to loosen up the powder.
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