Black/Gray Water Tank And Draining; Black/Gray Water Tank And Draining; Drain System Cleaning - Airstream REI SPECIAL EDITION Owner's Manual

Maintenance

Black/Gray Water Tank and Draining

When you are in a park 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 wash entirely 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.
Black/Gray Water Tank Dumping
To empty the black/gray combination tank (REI 16), or
one or both separate black and gray tanks (REI 20),
start by attaching the sewer hose. Press the bayonet
fitting onto the dump valve outlet and rotate clockwise
until it feels solid and secure. Attach the outlet end of
the hose to the sewage outlet, making sure the hose is
placed so it will drain completely.
REI 16 Tank Dumping
1� Combination Wastewater/Sewage (Gray/Black)
Tank Valve
2� Drain Cap (Drain Hose Hookup)
3� Drain hose storage
4� Auxiliary Light
5� Auxiliary Light Switch
Pull the Combination Wastewater/Sewage (Gray/Black)
Tank Valve handle as far as it will go and wait until the
tank is drained. Close the dump valve, partially refill
the tank with clean water, and repeat the process until
clean. The holding tank must be flushed out until all
paper and waste material are removed. Should solids
8-14
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. Replace the bayonet ring cap before to
traveling�
REI 20 Tank Dumping
1� Gray Wastewater Tank Valve
2� Black (Sewage) Tank Valve
3� Drain Cap (Drain Hose Hookup)
4� Auxiliary Light
When dumping, the main holding tank (black tank)
should be dumped first, then the auxiliary holding tank
(gray tank). This process will help rinse the sewer line
with auxiliary holding tank water.
Pull the Black (Sewage) Tank Valve as far as it will
go and wait until the tank is drained. Close the dump
valve, partially refill the tank with clean water, and
repeat the process until clean. The main holding tank
must be flushed out until all paper and waste material
are removed. 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. Pull the
auxiliary tank valve handle to drain the gray water tank.
Replace the bayonet ring cap before to traveling.

Drain System 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.
2024 REI Special Edition