Take off the water supply hose a by pulling down the pressing rod b and the pressing handle c.
Take off the water filter from the tap by turning it clockwise.
Take off the cap filter d by turning it counter-clockwise.
Take off the filter e by pulling it up.
Clean the filter with the brush and water.
After cleaning, reassemble the filter.
Be careful if filter rubber comes loose, insert rubber before installing cap filter.
If the external filter is damaged, purchase a new one from an LG Authorised Service Centre.