Thor Motor Coach Class C, Owner'S Manual

Page: 69 / 97

Thor MoTor CoaCh
WaTEr SYSTEMS
70
holding Tanks
MoST ChEMICaL MIXTUrES For hoLDING TaNK oDor CoNTroL arE
PoISoNoUS. FoLLoW ThE ProDUCT MaNUFaCTUrEr’S DIrECTIoNS aND
WarNING WhEN USING aNY hoLDING TaNK aDDITIVE.
Drain valves and drain hose storage are located on the driver’s side. Each tank has a separate drain line and
dump valve, which permits dumping tanks individually or together. Each tank should be emptied at a dump
station designated for this purpose. Most national, state, and private campgrounds have dumping facilities.
Many have hookups on the campsite, while some have portable dump collectors. Many service stations,
particularly along interstate highways, also have these facilities. Many campground directories list dumping
station locations across the nation.
If possible, dump holding tanks before a trip, to reduce the gross vehicle weight. Enough water should be kept
in the black water tank to cover the bottom, to prevent hardening of any residue that may remain.
Do not dump black water tank until it is 3/4 full. This practice makes sure that enough water is in tank to flush
all wastes into sewer lines. If necessary, fill tank to the 3/4 mark with additional water before draining.
Never put anything in the holding tanks other than normal drain water, wastes, and biodegradable products.
Paper wrappers, gum, cigarettes, etc., no matter how small they may be, should never be placed into either
the gray or black tanks.
Note : It is important to note that harmful and toxic materials can accumulate if the holding
tanks are not regularly drained and thoroughly rinsed. It is also important to use
holding tank deodorizing and cleaning agents in the waste water tanks to reduce
odors and keep the lines open and free-flowing.
Note : The diagram below shows a typical waste water system termination valve layout.
TERMINATION
VALVES
TERMINATION
VALVE
(SOME MODELS)