The kinetic energy of the mass of exhaust gas carries it along the exhaust pipe, and causes a pressure build up ahead of the mass of gas and a partial vacuum behind it. This principle is used in a tuned exhaust system.
Culligan - $2352 ($2053 w/o R/O unit) Culligan Gold Series (10), Good Water Machine. If I were to look at price only, I would go with either the cheaper Ecowater system w/R/O at $2698 or the Culligan system. At almost $4k, the Kinetico system seems greatly over priced.
Typical costs: 1  Ion-exchange water softeners start around $400-$1,000 for a basic unit. 2  Units with the capacity for larger homes start around $1,000-$2,500 but with installation can go as high as $3,000-$10,000, depending on the options chosen.