LG WAD34UW2R Owner's Manual page 28

Filter Changing Cycle and Method
Press and hold 120ml, 500ml and 1000m

buttons simultaneously for about 3 seconds
after replacing the filter.
Press and hold 120ml, 500ml and 1000m buttons
simultaneously as in the figure.
- After the filter is reset, the next replacement alert will
be provided by checking the usage period and water
amount used.
Install filter cover.

Let out 10 liters of purified water for the

purification-only model.
(Water will appear murky with small bubbles,
which is stabilization process of the filter.)
Let the filter stabilize for about 25 minutes

before using the purifier.
((Otherwise, you may hear the air bubbles filling
the internal tubes popping.)
28
10 liters
after replacing
25 minutes