Standard Portable Toilet
A Standard or Regular Portable Toilet is an enclosed unit with a door that can be locked from the inside. Although color, shape and weight vary, all are approx. 4' wide x 4' deep x 7.5' high. Most of a portable toilet's components are manufactured from high density polyethylene (HDPE). HDPE has a high tensile strength and is resistant to many solvents. Its applications include tupperware, laundry detergent bottles, milk jugs, fuel tanks, plastic bags, natural gas pipes, water pipes, and refillable bottles. It is also used to manufacture large sheets that line the bottoms of sanitary land fills to prevent the liquid constituents of solid waste from leeching into land and groundwater. With the use of HDPE, a portable toilet will maintain its structural integrity, thereby containing the waste and preventing pollution of surrounding areas.
All interiors consist of a toilet seat affixed over a 50 - 60 gal holding tank which contains approx. 5 gal of liquid chemical for breaking down waste, interior door lock, air vents, and toilet paper dispenser. They are usually stocked with seat covers, toilet paper and waterless hand cleaner. The interior is also designed to accommodate an interchangeable sink or urinal.
The differences between manufacturers are largely aesthetic. Variance in footprint and placement of interior components make some brands more .roomy. than others. Variance in the HDPE density affects weight and perceived durability. Exterior shape and color varies widely. Below are a few examples.
Synergy Standard | 
Satellite Industries Standard | 
Five Peaks Standard |
Placement of the unit upon delivery is quite important. Service trucks are generally equipped with 25' of hose for pumping waste. However, the closer the truck can get to the unit, the better the suction -- so a unit 25' away from the truck cannot be cleaned as well as a unit 15' away.
The two main uses for Standard Portable Toilets are Construction/Facility and Special Event. Most portable restroom service providers maintain separate inventories, often using their newer units for special events and rotating them to construction/facility inventory where daily use quickly produces signs of wear and tear.
Standard Portable Toilet with Interchangeable Urinal or Sink
Current industry practice is to design the Standard Portable Toilet with the ability to accommodate interchangeable sinks or urinals inside the unit. In-Unit Sinks incorporate a foot operated water pump, a separate (non-potable) water reservoir, and hand soap dispenser. They discharge directly to the holding tank.
PolyJohn Standard Interior
Urinals affix to the interior and discharge to the holding tank. They are increasingly designed with a focus on preventing splash. Often, "Urine Blocks", activated by urine, are used which discharge a deodorant to neutralize the odor. Some states, however, have begun to ban their use because of chemical build up at waste processing facilities. The alternative is a less effective air deodorizer that masks the smell.
Five Peaks Unit w/ Urinal
Urinal: The twin sheeted urinal with custom formed mounting pads not only add strength but also assist in alignment making installation a snap. The large opening combined with the unique oval design is the key to reduced splash.
Future designs may do away with the interchangeability option as several states now require a separate, stand-alone handwash station for job sites and large events.
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