UASB means Up flow Anaerobic Sludge Blanket technology. A technology that is mainly applied for the treatment of wastewater. The principle is that bacteria’s convert organic compounds into biogas under air pressure. In this way the water will not just be purified, but an environmental source of energy is created at the same time. This combination is the reason that we often use the term reactor instead of tank. The Monostore system is a building method that is eminently capable of coping with the pressure that arises in such a reactor.