It goes by many names - porta john, portable toilet
Once pretty much just a hole in the ground, the portable sanitation unit has been in its present form since the 1960s, and a lot of innovations have come along since then. In their most basic form, they are one-person sanitation units, that can stand alone. They are weighted down by the waste tank, and include a liquid disinfectant dispenser and deodorizer. Some have simply a sitting toilet, while others include urinals, as well. Of course, they all have locking doors, with ventilation at the top.
When you consider a porta potty rental, you're going to want something as pleasant as possible. Most of the people are going to need to visit at least once, and it's important they do not have their work day or entertainment ruined by a terrible experience in the bathroom. Think about the type of toilet paper included. Are washing stations included, if a sink isn't available? What about hand sanitizer, if there's no ready water? If there is available water, have you considered soap and towels? Some units even provide warm water, though these might require a power source provided by you. There are even some that look like the inside of a cabin, complete with running water, at added expense.
Consider putting your porta potty rental to work for you in more ways than one. If you're running an entertainment event where large numbers of people will be using the sanitation units, you could put advertisements on the side - something eye-catching in order to promote future events or other products while your customers, visitors, or patrons wait in line.
There's no doubt that a porta potty rental will cost more than a permanent outdoor latrine, in the long run, but there's something to be said for portability, too. The companies that rent the units guarantee their facilities will be clean. They will drain, clean, disinfect, and deodorize them, so you don't have to do any of the work. For a small raise in cost, they will come and do it more often than the standard rate. Unlike a permanent facility, you never have to worry about a porta potty getting clogged. It can be hauled in the back of a pickup truck. And each unit can hold enough waste for ten people working 40-hours a week before it needs to be cleaned. (Though you can have it done more often than that, of course.)
Porta potty rental is essential, not only for events, but for worksites where the work is done primarily out of doors, as in construction. Consider a unit made specifically for a high-rise construction project, made so it can be rolled on casters or lifted by crane or elevator, so no one has to go down ten floors just to find a restroom.
There are few things as important as what restroom facilities you will provide. Think about your needs and the needs of your employees or clients the next time you consider a Porta Potty Rental.