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jackpuck Reviewed by jackpuck on . DIY: Carbon Air Filter - CHEAP, and EFFECTIVE! Security is important to marijuana growers, and odors can lead the police or unwanted neighbors straight to your grow room. There are a number of 'odor solutions' out there, but they can be quite costly. Here is a simple method you can use to build your own carbon filter. It will take you about half an hour to construct it, and it will cost $20 to $30 dollars. And it is completely safe. Aside from its main advantage of being ultra cheap, this method is also very versatile. It utilizes the Rating: 5