Dometic MasterFlush
7.4
Winterizing
At the end of each season, the Dometic macerator toilet should be winterized for storage by using
potable water-safe antifreeze (if boat or vehicle will be exposed to freezing temperatures) .
If system will be subjected to freezing temperatures, please follow procedures in section 7 .3,
"During extended periods of non-use", and then winterize system as described here .
Note
Use nontoxic antifreeze designated for potable water systems . (See boat or vehicle
owner's manual .)
Caution
Never use automotive-type antifreeze in freshwater systems .
PRESSURIZED FRESH WATER SYSTEM
1 . Drain potable water tank and empty holding tank .
2 . Add freshwater antifreeze to potable water tank .
3 . Flush potable water antifreeze and water mixture through toilet(s) and into entire system,
including the waste holding tank, diverter valve connections, discharge pumps, etc . Turn off
power to toilet .
Each installation is different, so amounts may vary . User discretion is required to assure
adequate protection .
SEA WATER SYSTEM
Parts required:
1 . Close intake and discharge seacocks . See Hazard of Flooding risks in this manual .
2 . Turn off power to toilet .
3 . Disconnect and drain intake hose and in-line filters .
4 . Connect hose to sea water pump intake .
5 . Place hose connected to pump intake into bucket with antifreeze in it .
6 . Turn on power to toilet and flush until antifreeze is removed from toilet .
7 . Disconnect power to toilet and reconnect all intake and drain hoses .
10
• Hose that fits sea water pump, about 3 ft . (1 m) long
• one container