LG WM2496H M Series Manual page 28

Dispenser
WM2496H*M
If liquid detergent is added to the pre-
wash box, it will run immediately into
the tub. This does not affect the
operation of the cycle.
To use liquid detergent in the main
wash, place the detergent siphon box
in the main wash compartment.
Otherwise, the main wash liquid
detergent will run into the tub along
with the pre-wash detergent, causing
oversudsing in the pre-wash and no
cleaning in the main wash.
p20~21