A system for separating water from debris. An alternating voltage generating means containing a pulse-wave voltage and an alternating current is connected with the primary side of a transformer, and a driven member such as the measuring means for any of varying electric current, voltage and resistance is connected with the secondary side. In embodiments, the coating may also include a colorant, such as carbon black. The vent has a vent body including an inlet configured for coupling to the tube to receive the liquid from the tube and an outlet configured to pass the liquid to the humidifier.