First, power off and unplug the All-Weather 120V heat pump. Then, pull off the front cover. Pull the condensate filter upward until the bottom end is visible. Take the filter out of the tray. The tube should stay on. Never pull on or remove the tube. Unscrew the filter. When you rinse the filter, use distilled water or a bleach solution--never plain tap water. To make the bleach solution, add one teaspoon of bleach to a gallon of water. Hold the filter upside down and rinse it with the bleach solution to release any trapped sediment. Once the filter is clean, screw it back into the plastic housing. Lift the filter to return it to the tray. Make sure the tubing routes into the side of the unit without bending or twisting. Reattach the front cover, then plug in and power on.