The Delta-Larm is a buzzer that is used to alert operators across a variety of industries. This buzzer is a great choice to use in the control panel or alarm system of your aerobic treatment unit (ATU). Most ATUs have a high-water alarm system. The Delta-Larm can be used to give that alarm system a voice. This unit emits 87 decibels at 10 feet. Homeowners can rest assured that their system will alert them when there is a problem.