How Does a Restroom Trailer Work?

One of the most asked questions we get is how do restroom trailers work? It’s understandable, as there are seemingly limitless options available in restroom trailer technology today.
A graphic showing how a restroom trailer works

Restroom Trailer Water Source

Like plumbing in your house, a portable restroom trailer requires a water source in order to function. If you have your trailer at a campsite or event there is a good chance that they will have a water hook-up. If not, most all restroom trailers will have a freshwater tank that you can draw from.

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Restroom Trailer Flushing

When it comes time to flush there are a few things to keep in mind. First and foremost, you should avoid putting anything besides human waste into the toilet. In terms of toilet paper, you should use RV specific products as they dissolve easy and will be less of a burden on the system – helping you avoid bigger problems further down the line.

Restroom Trailer Water Tanks

Every portable bathroom trailer has three water tanks. The freshwater tank holds water for use in the kitchen and bathroom. The grey water tank holds wastewater from the sinks. All toilet waste will be deposited into the black water tank after you flush.

As you can imagine, the grey and black water tanks require more maintenance than the fresh water tank. These two need to be emptied every couple of days, depending on how much your customers are using the trailer toilets and sinks. 

Ideally you will remember to empty all tanks before you hit the road, as the added wait can sufficiently reduce your fuel economy. 
Depending on where you are using your restroom trailer, most campgrounds will have dump stations where you can empty grey and black tanks. 

Each has a specific valve and hose connection to seamlessly empty all waste into the provided sanitation station. If you empty the black tank first, you can use the semi-clean grey tank water to help flush the more foul contents from the black tank out of the hose. Once you have emptied both tanks, run fresh water through the toilet to clean out any remaining waste, close the valves, and rinse your hose. Add some waste treatment supplies to the tank via the toilet, and you’re ready to hit the road.

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