A carbon filter helps control the powerful scent that arises from growing indoors, and is arguably the best way to control it. A carbon filter works by filtering the air for almost all particles up to 99%, however, a carbon filter deteriorates its quality over time, so it needs to be renewed regularly. Don't worry about a carbon filter affecting the taste or scent of your plants, it will solely filter the air coming out of your gritty or closed growing area. For a carbon filter to work, use a fan to draw air through the filter. We always recommend using a charcoal filter if you live in densely built homes to avoid the smell of your neighbors. If you are looking for a specific carbon filter, or a specific size that you cannot find on the site, we will be happy to make it your home.