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.
But with culligan you lease the equipment and pay monthly or quarterly. Do yourself a favor, find a private water treatment contractor and have them test the water properly and install a system that requires only one yearly maint. A softener would prob run you $1100-$1600 depending on size.