GE WSSH300G Technical Service Manual page 18

As the water passes over the detergent section, holes in
the cavity allow some of the water to enter and flush the
detergent cavity.
Since the flow of the incoming water is more than the
holes can dispense, the excess water backs up into a
channel across the rear of the dispenser.
Water in this channel and the mixture from the deter-
gent drawer flow into the tub through the large hose at
the rear of the dispenser.
Detergent is dispensed at the start of the cycle, but
bleach and fabric softener are not dispensed until later
in the cycle. To allow all three items to be added to the
washer before the start of the cycle, the bleach and soft-
ener cavities in the drawer have tubes molded into the
bottom of them.
Softener
These tubes allow bleach or softener to be added to
their cavity without being dispensed as long as the liquid
is below the top of the tubes. At the proper time in the
cycle, when bleach or fabric softener is to be dispensed
water is added to the cavity. This raises the mixture
above the top of the tube and the bleach or fabric soft-
ener starts flowing into the tub.
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Bleach