If you're worried about the fail-safe of your sump pit during a power outage with your drip system then there's another way to set it up; have the incoming water set up on a float valve in your [aquarium] sump, then run a small pump on a timer to run for X hours/minutes Y times per day pumping to waste to remove the desired amount of water from your tank. If there's no power then the pump won't run and it won't overflow your sump pit.
