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.
Water Softener Prices. You may purchase a cheap water softener for $500 to $700 from a company like this one. This will do the job for you but the quality of this system may not be as good as higher priced water softener and purification systems. It will cost $1,000 to $1,700 for a mid-range quality water softener. You may buy a high quality, high volume water softening system for $2,000 to $10,000.