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A procedure for replacing a filter says, "Open the housing and remove the cartridge." The cartridge may contain caustic cleaner. Which revision best improves completeness and safety?
Open the housing and remove the cartridge as quickly as possible.
Put on chemical-resistant gloves before opening the housing and removing the cartridge.
Remove the cartridge, then decide whether gloves are needed.
Open the housing and review the warranty before removing the cartridge.
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