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EARTHBOUND RECREATIONAL VEHICLE TRAILER OWNER'S MANUAL
DRAIN AND WASTE SYSTEM
Your trailer has a drain and waste system that includes waste-‐holding tanks made from molded plastic, free
from corrosion problems, with trouble-‐free dump valves.
The Black holding tank enables you to use the toilet for several days away from disposal facilities.
The wastewater from the sink, shower, bath and lavatory drains in the Grey holding tank.
Each tank has its own dump valve, however, both tanks drain through a common outlet. Therefore, you
need to make only one connection when hooking up in a trailer park with sewer facilities.
CAUTION
: Never put wet strength paper towels or tissues in your holding tank since they won't
dissolve and can "catch" in the mechanism of the dump valve. Colored toilet tissue is slower to
dissolve than white. Most RV accessory stores offer tissue designed for RVs that will completely
dissolve.
Deodorizers
There are many deodorizers on the market in tablet, liquid and powder form. These not only combat odor,
but also stimulate the bacteria that works to dissolve the solids in your tank.
Monitor Panel
Check your monitor panel frequently. When the BLACK WATER HOLDING TANK is completely full,
sewage cannot be emptied from the toilet bowl. If the GREY WATER HOLDING TANK is overfilled,
drain water will "backup" into the tub and cause an unpleasant cleaning job. Never drain the tanks at any
place other than an approved dumping station.
Emptying Tanks
Almost all campgrounds will have dumping facilities.
To empty one or both tanks attach the sewer hose by pressing 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 that the hose is placed so it will drain completely.
Pull the dump valve handle as far as it will go and wait until the tank is drained. When dumping, the black
holding tank should be dumped first; then the grey holding tank. This will help to rinse out the sewer
line with grey holding tank water.
The black holding tank must be flushed out until all paper and waste material is removed. Close the dump
valve and refill the tank with clean water and repeat until clean. Replace the cap prior to traveling.
Care should be taken not to overfill the grey and black water holding tanks. Overfilling could cause
wastewater to flow past the shower P-‐trap into the shower, and in extreme cases even into the lavatory and
galley sinks.
An overfilled tank could also block the tank venting system creating an air bubble below the
toilet. The air bubble would be released as the toilet is flushed. This could cause a small amount of
wastewater to blow up past the flush valve. Tanks that are accidentally overfilled should be dumped at a
waste disposal station immediately before using the trailer’s water system.
