We’ve got some friends who have two sump pumps. One is a backup and sounds an alarm when it is switched on. But this only works as long as they’re home to hear it. [Felix Rusu] came up with a ...

A submersible sump pump is designed to work in a pit ... Some household sump pumps will sound an audio alarm when the pump turns on, letting you know there is enough water accumu l ating in ...