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You should always recharge an extinguisher after any use, for two reasons: 1. Using the extinguisher can disturb the sealing on the valve, allowing the pressurising gas to leak away (this is particularly a problem with dry powder extinguishers). 2. CO2 extinguishers only discharge for about 12-15 seconds for a normal-sized unit: a half-empty unit leaves the user only about 6 seconds of extinguishing time. it's illegal to replace a half-used extinguisher in a public building in most areas.

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