MotorHome, June 2008
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Q. We flush our motorhome's blackwater tank often, but the monitor panel always shows the tank is full, even when it is actually empty. Is there a trick for getting the sensors to work properly?
A. Probably the easiest way to help clean the inside of the tank and the contacts is to dump the tank, then add 10 gallons or so of fresh water to it.
Flush about 20 pounds of ice cubes down the toilet and drive it. If you drive on a winding road and/or brake heavily, the ice will slosh and help scrub the insides of the tank.
You also can use a holding-tank sensor cleaner, or a spray wand made for the job. Both are available at RV stores, including Camping World.
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