Airstream INTERNATIONAL TRAILER Owner's Manual page 86

AIRSTREAM INTERNATIONAL TRAILER OWNERS MANUAL
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 seats 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.
When winterizing drains use only trailer plumbing system type antifreeze. These are sold through your
dealer.
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