Plumbing Systems and Holding Tanks
07-6
3. Allow enough time for the tank to drain
completely. Rinse and ush the tank
through the toilet. When the tank is empty,
push the handle in to close the valve. Run
enough water (up to ve gallons or so) into
the tank to cover the bottom. This will aid
the break up of solid wastes, and reduce
“pyramiding” of waste material.
4. To drain the gray water tank, repeat the
steps above using the small knife valve.
This tank is drained last to aid in ushing
the outlets and hose. The gray water knife
valve may be left open in a semi-perma-
nent hookup.
5. See the tank ush system instructions in
the next section if your recreational vehicle
is so equipped.
6. Remove the sewer hose and cap the outlet.
7. Rinse out the sewer hose with fresh water
and remove the sewer hose from the dump
station.
8. Replace sewer or dump station covers.
Black Tank Flush System
(If Equipped)
A black water holding tank system that is
equipped with a ush system has rinsing spray
heads inside the tank that will aid in the removal
of sewage residue from the interior of the
holding tank. To operate the tank ushing sys-
tem, follow the procedures for Draining The
Holding Tanks in this chapter. After dumping
the gray water tank proceed as follows:
1. With the dump valves open, attach a garden
hose to the black tank ush inlet connection.
2. Turn on water supply to garden hose and
allow the water to run for approximately
three minutes to ush tank.
3. Turn off water supply to garden hose.
4. Remove hose from black tank ush inlet
connection and store hose.
5. After rinse water has thoroughly drained
from the black tank, close the knife valve
and replace the termination cap. Rinse
out the sewer hose with fresh water and
remove the sewer hose from the dump sta-
tion. If you are parked at a site with a semi-
permanent sewer hookup, keep the black
water knife valve closed to allow the waste
level to build up. The outlet will probably
clog if you leave the knife valve open con-
tinually. Run enough water into the tank to
cover the bottom. This will aid the break up
of solid wastes.
6. Replace sewer or dump station covers.
Please...Practice good housekeeping when
draining wastes at a campsite or disposal
station. Leave the site in good order.
Above all, do not pollute.
Holding Tank Care
Since holding tanks don’t rely on any sophis-
ticated 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
Do not use the same hose you use for lling the
potable water tank, or for connection to the city
water inlet. This is especially true if you the connect
the quick connect hose to the typical rinsing hoses
at most dumping stations. Use of a different hose
will insure that you will not contaminate your fresh
water supply.
CAUTION
!
CAUTION
The sewer drain valve must be open when using the
black tank ush inlet.
CAUTION
The sewer drain valve must be open when using the
black tank ush inlet.
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