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 general, salt-based water softeners cost about $400 to $2,700, depending on the model. Salt-free water softeners range in price from about $1,300 to $3,000. Magnetic water softeners may cost just under $100, or as much as $800.