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.
If you use lake water in your home, call your local Culligan Man! He can help you check your water filtration systems to ensure you have the best tasting drinking water all summer long. Locally owned and operated since 1983, Culligan Water Store is your Nova Scotia Water Specialist.