How do I clean the drain pump filter?

First, turn off the water tap and drain the water using the drain hose. Open the lower cover cap using a coin, turn the drain plug to pull out the hose, unplug the drain plug to let water flow out into a vessel, then turn the pump filter open to the left. Remove any foreign material from the filter, turn it clockwise to close, reinsert the drain plug, and close the lower cover cap.