Airstream 2007 Safari - Manual (Page 69)

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PLUMBING
BLACK TANK FLUSH (Optional)
The trailer has a water hose connector marked “black tank flush”. To use, hook up a
hose and turn on full force. Within the tank a spray head with a multiple holed head
will spray the interior surface of the tank. The vacuum breaker and check valve will be
located inside the trailer above the exterior connection. In most models this will place
them under the lavatory.
The gate valve should be closed for the first couple of minutes, and then opened to let
the water out in a rush. Repeat as needed.
When Parked and Connected to Sewer Outlet
When you are in a park and connected to a sewer outlet keep the main holding tank
dump valve closed, and empty the tank every few days or whenever it becomes
almost full. ONLY BY SENDING A LARGE VOLUME OF LIQUID THROUGH THE MAIN
HOLDING TANK AT A TIME WILL TOILET PAPER AND OTHER SOLIDS COMPLETELY
WASH AWAY.
This practice will avoid the accumulation of solids in the main holding tank, which
could lead to an unpleasant cleaning job. Should solids accumulate, close the dump
valve; fill the tank about half full with water, then tow the trailer for a few miles. The
turbulence and surging of the water will usually dissolve the solids into suspension
so the tank can be drained. Keep the auxiliary tank valve open when connected to a
sewer outlet.
Draining the tanks as described will protect them from freezing during storage. When
traveling in sub-freezing temperatures use a winterizing solution designed for RV use.
Follow the directions on the container.
Drain Systems Cleaning
The only cleaning agents that can be used without causing harm to the system are
household ammonia and tri-sodium phosphate in small quantities. Do not use any
product that contains any portion of petroleum distillates. This attacks the rubber seals
of your toilet and dump valve. Also, do not use any dish detergent or abrasive cleaners.
All products should be marked approved for ABS drainage systems.
Use only RV type antifreeze, approved for plumbing systems, when winterizing drains.
These are sold through your dealer.