Designed for biological aeration in domestic wastewater treatment units and ATUs, the Envirosure alarm from Blue Diamond Pumps can be fitted or retrofitted to an aerator to detect low pressure or power outages. It has compact and lightweight housing and low power consumption to minimize operating costs. The alarm helps ensure systems meet wastewater flow regulations and avoid environmental hazards and fines, according to the maker. It comes in multiple versions, with options including a bright LED beacon, plug-in or hardwire to allow for versatile installation. 770/831-1122; www.bluediamondpumps.com.