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.
And one thing we have to mention also is the fact that some experts and consumers tend to compare Kinetico systems to Culligan water softeners more often because of their similarities in terms of the price, certain features, installation requirements, and warranty coverages (both brands covers 1 year warranties for labor).