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.
Culligan Water Conditioning of Roswell, NM is your local Culligan dealer and your local water quality expert. Contact us today for a free in-home water test, consultation on top-of-the-line softeners and whole-house filtration systems, salt delivery, bottled water delivery, or repair services on any brand of softening and filtration equipment.