Biogas derived in waste processing plants and recycling digesters can be used to produce electrical power or upgraded to bio-methane to be used as fuel or pumped into main gas pipelines. Before being used, biogas must be filtered, purified and dehumidified. Dehumidification is always necessary. In this market sector Green Box has operated for over 16 years. During this period great experience has been accumulated, a lot of special solutions have been developed, and hundreds of reliable and efficient units have been supplied.