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Plumbing Systems and Holding Tanks
Holding Tank Care
Since holding tanks don’t rely on any sophisti-
cated mechanical devices for their operation,
they are virtually trouble-free. The most com-
mon problem is also an unpleasant one – clog-
ging. You can minimize the chances of clogging
by keeping the following considerations in mind:
• Keep the black water tank knife valve
closed. Fill tank to at least
3
⁄4-full before
draining. Be sure to cover the tank bottom
with water after draining.
• Use only toilet tissue formulated for use in
septic tank or RV sanitation systems.
• Keep both knife valves closed and locked,
and the drain cap tightly in place when
using the system on the road.
• Use only cleaners that are approved for use
in septic tank or RV sanitation systems.
• Use a special holding tank deodorant chem-
ical approved for septic tank systems in the
black water holding tank. These chemicals
aid the breakdown of solid wastes and make
the system much more pleasant to use. Do
not put facial tissue, paper, ethylene glycol-
based or other automotive antifreeze, femi-
nine hygiene products or household toilet
cleaners in the holding tanks.
• Do not put anything solid in either tank
that could scratch or puncture the tank.
If the drain system does get clogged:
• Use a hand-operated probe to loosen stub-
born accumulations.
• Seriously clogged P-traps may require dis-
assembly. Be careful not to overtighten
when reassembling.
• Do not use harsh household drain cleaners.
• Do not use motorized drain augers.
• Sometimes the holding tank valve will get
clogged. In this case, a hand-operated auger
may be necessary. Be ready to close the
valve quickly once the clog is cleared. If the
seal gets damaged, it is easily replaced.
Cold Weather Usage
On certain model configurations, the holding
tank(s) area may be heated through ducts from
the furnace or it may be heated by the optional
heat pads. To prevent holding tank freeze-up,
the furnace thermostat should be set to maintain
a minimum of 33 degrees Fahrenheit in the
holding tank(s) area. Be aware that exposed
drains may freeze quickly.
Typical Hot and Cold Diagram
CITY WATER
INLET
WATER SYSTEM DRAINS
EXTERIOR SHOWER
BYPASS WATER PUMP
FILTER
SHOWER
VENT
BYPASS
TOILET
WATER TANKS
GALLEY SINK
WATER TANK
DRAIN
LAVATORY SINK
WATER HEATER
WATER FILL
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