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We have lots of folks who call us asking which is the correct 3M respirator cartridge for their job. It's not always easy to know. 3M alone has more than 20 cartridges and filters for different types of work. We'd like to start breaking down the different uses each of these products, and we will start with some of the most popular. All of the cartridges we'll discuss are filled with activated charcoal. Each has slightly different characteristics, so let's discuss which solution is best …