Black Water Tank Dumping; Black Water Tank Flush; Drain Systems Cleaning - Airstream Classic 2016 Owner's Manual

1 Black Water (Main) Dump Valve
2 Light
3 Light Switch
4 Auxiliary Tank Dump Valve
5 Drain Cap

Black Water Tank Dumping

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, all at once, through the main holding tank 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.
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.
Classic

Black Water Tank Flush

The trailer has a water hose connector specifically
for flushing the Black Water Tank. 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.

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 type of product will attack the rubber
seals of your toilet and dump valve. Also, do not use
any dish detergent or abrasive cleaners. All products
should be marked as approved for ABS drainage
systems.
Maintenance
8-15