My Aprilaire new water pad has a white substance on it. I mentioned this because twice the pad (tworeleased a sticky, mucous substance that plugged the drain line and caused flooding in my basement. The intake water line is attached to the hot water line in the water heater. I have a Aprilaire humidifier, Model 560
Humidifiers - Aprilaire - 550 Humidifier
Answers & Comments
Hello,All the pads have a protectant(white) coating because the pad is aluminum and would rot out fairly quickly from getting wet.The slime is bacteria(fungus) not from the coating that forms from stagnant (sitting) water.Make sure the unit is draining out dry after each cycle.With the pad out pour vinegar OR bleach & water (10:1) to kill the mold in the drain pipe.Do not clean the pad at all ,it gets replaced.They sell an inexpensive wet floor alarm at the store that makes noise when wet.