Regal 53 SC Owner's Manual page 407

PUMP-OVERBOARD DISCHARGE
If your boat is equipped with an overboard discharge
pump pay close attention to what materials are fl ushed
through the waste system as it could become clogged. Do
not pump garbage, rags, or sanitary napkins through the
overboard discharge pump (macerator). Flush the waste
tank and pump with fresh water with each pump out. Do
not run the pump dry or for extended periods of time
since the impeller can be damaged.
Pump the waste system out at decommissioning time and
rinse fresh water through the entire system periodically to
keep the hoses clean of debris especially the pump out
hose.
Macerator
Pump
Cosmetic Care & Maintenance
61