10
What to Put in Holding Tanks
Black Tank:
Before using the toilet, treat the sewage holding tank with water mixed with an odor-controlling
chemical. These chemicals are readily available at most RV supply stores. Pour the chemicals into the holding
tank through the toilet. Add approximately three gallons of water to the holding tank first. Next, mix the
chemicals, in accordance with the manufacturer instructions, with approximately one gallon of water. Pour
mixture through toilet to the holding tank. Be careful not to spill the chemical on your hands, clothing, toilet
bowl or carpet as it can cause a permanent stain. Extremely hot weather areas may require adjusted amounts
of chemical to help with odor control. Repeat the chemical pre-charge to the holding tank each time the tank is
cycled.
WARNING:
Most chemicals for holding tank odor control are poisonous. Follow product manufacturer’s directions
and warnings when using holding tank additives. DO NOT use products that contain petroleum distillate
or ammonia in place of RV odor controlling chemical. Petroleum distillate or ammonia will damage the
ABS plastic holding tanks and seals.
Grey Tank:
The grey water waste tank stores the sink and shower drain water. No chemical is required in this
holding tank; however, a waste holding tank can produce odors. A reduced mixture of chemicals can help with
odor control.Ensure that there is enough liquid in the holding tanks prior to dumping the waste holding tanks. This
provides a smooth flow through the valve, drain pipe and drain hose. When cycling the tank with sufficient liquid,
a swirling action should remove accumulated solid wastes along with the waste liquid. Empty the sewage tank
weekly to prevent stagnation and over-filling.
Waste Drain Hose
A flexible 3” sewer hose attaches between the termination drain and the shore facility. Sewer hoses usually
come in 10’ or 20’ lengths. The shore fitting for the sewer hose may be a 3” or 4” inch pipe, which could be male
or female thread. Another possibility may be a four inch pipe, with no threads, covered by a metal plate. There are
many configurations. Different style adapters are available to fit most configurations. Hose ladders may also be
purchased to support the hose. It is important that the hose remains secure. Always tighten clamps and restraining
devices before use. Lay the hose inline between the termination outlet and the shore fitting. Restrain the hose to
prevent movement during use. Wear protective and/or disposable gloves when handling the sewer hose.
To Attach the Hose:
1. Remove termination cap. Align coupler tangs with termination tabs. Twist coupler clockwise 90º locking
coupler to termination outlet.
2. Attach the other end of the hose to the drain service. Restrain hose to prevent movement during use.
3. Open the liquid waste drain water valve.
NOTE:
Close the liquid waste drain water valve 24 hours prior to departing to allow the tank to fill with
liquid to help in the dumping process.
The solid waste drain water valve remains closed until the tank is full or until time of departure. This will
help prevent accumulation of solids. Use the outside faucet or shower attachment for
washing or rinsing.
NOTE:
Lubricate the O-ring on the sewer hose adapter periodically with silicone
spray. Use care when connecting the sewer hose adapter to the termination
outlet in cold weather.
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