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.
Here are the features you can enjoy while using the Culligan High Efficiency Twin Tank And High Efficiency Progressive Flow Water Conditioner: 1  Tank size: 1.0-3.0 ft3 (each tank) 2  Has a twin tank system that will alternate in the production of soft water (similar to Kinetico water softeners)