Supermax (short for: super-maximum security) is the name used to describe control-unit prisons, or units within prisons, which represent the most secure levels of custody in the prison systems of certain countries.
Consumer Complaints and Reviews. Outrageously expensive for services not provided: $690 - the cost to purchase your own, high-quality softener and RO filtration plus 1 year of filters and salt. $5,770 - the cost of a 3-year contract with Culligan to rent their basic softener and RO filtration with service.
In Summary: Porta Potty Rental Costs. On average, the cost to rent a portable toilet for one day runs from $75 to $100. If you will need to keep the porta potty on site for an extended period of time, the price comes down significantly to $175 to $400 per month depending on how often the unit needs to be cleaned. There are a lot of names for these modern outhouses.