04-09-2016, 11:28 AM
Hi Chris, the optical sensor is the main sensor, the float is used as a backup. I would say the float switch should be sitting just above the optical sensor, this way if the optical sensor fails the float switch will cut the circuit. The float switches are reversible, if you flip the ring it woks opposite. With it setup like this none of the sensors are in the water which should help in the long term for reliability.