Preventing Holding Tank Blockage - Thor Motor Coach 2011 Avanti Owner's Manual

The holding tanks are enclosed sewer systems, and must be drained into
an approved dump station. Tanks should be thoroughly drained and
rinsed to prevent any accumulation on the interior of the tanks.
1. Twist off the termination cap counterclockwise. Some liquid may be trapped
between the valves.
2. Connect the sewer hose by turning it clockwise, making sure that the connection end
levers are locked over the termination end.
3. Deposit the other end of the sewer hose into an approved dump station inlet.
4. Open the black termination valve first and drain.
5. Open the gray (smaller) tank valve to drain and flush out the hose.
6. Rinse the tanks and hose thoroughly with fresh water before disconnecting.
7. Close the termination valves.
8. Rinse the sewer hose with the faucet provided in the termination compartment.
9. Replace the sewer hose to the storage location.
10. Replace the termination cap on the outlet, making sure that it is secured and locked.
11. You may wish to add an approved deodorant chemical, approved for your sewer
system, to aid in the breakdown of solid wastes as well as making your system more
pleasant to use.
Do not leave the termination valves in the open position or open
them prior to having the sewer hose connected. Do not remove the
termination cap with the termination valves in the open position.
The most common holding tank problem is blocking the drain lines, which can be
minimized by following a few simple suggestions:
• Prior to dumping, make sure your tank is at least 1/3 full.
• Keep the tank valves closed, and the termination cap on.
• Fill and cover the bottom of the tank with water after dumping is complete
and leave the water in the tank.
• Use only approved, biodegradable, toilet tissue designed specifically for
motorhome systems.
• Always use plenty of water when flushing.
• Do not put facial tissue, paper, or sanitary napkins into your holding tanks.
• Do not put solid objects into the tank which could puncture or scratch your
tanks.
Chapter 6 - Plumbing Systems
HOW TO PREVENT
BLOCKAGE OF DRAIN
LINES
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