Aqua-farming: The dissolved oxygen (DO) is important for any aqua farming. DO is provided by the air blowers. For safety purposes, there are typically two air blowers paired together (just in case one fails). However, without periodically testing the secondary blower, there is no guarantee that once the primary blower fails that the back up blower will turn on automatically. Our critical equipment can successfully detect the failure of the primary blower and automatically turn on the back up blower. And, during each morning, the system will do a scheduled test for all the blowers (primary and back up blowers) to make sure all blowers are in the working and ready condition.