Moisture can play an important role in the final quality of the product. There are two main aspects of concern in moisture control in products: allowing too much moisture or too little of it. Moisture has different effects on different products, influencing the final quality of the product. Wood pellets, for instance, are made by taking remainders of wood and grinding them to make compact pellets, which are sold as a fuel. They need to have a relatively low water content for combustion efficiency. The more moisture that is allowed in the pellet, the more smoke that will be released when the pellet is burned.