June 16, 2010 
Personal health is becoming a very hot topic these days and one of the ways to achieve this goal is to increase one’s daily water intake. The type of water consumed is a very important aspect of this goal. The bottled water industry has made has an enormous profit as a result of this trend however, it is not very convenient for the average person to continually purchase, stock, recycle and restock those plastic water bottles. Many are now opting to have a water-filtration system installed in their homes. But, how exactly do they work? Most filters work in different stages. The following is a breakdown of the three stages of a KDF water filter.
Stage 1: Mechanical Filtration - Mechanical filtration occurs during the first stage of filtration and filters out the large particles from the water. This filter will remove particles like silt, sediment and sand from the water. Many filters on the market utilize only mechanical filtration thus enabling the smaller, harmful particles to enter into the drinking water
Stage 2: Electrochemical/Oxidation-Reduction - During the second stage of water filtration the KDF filter employs the use of copper and zinc to create an electrochemical and spontaneous oxidation-reduction process to filter out the smaller, toxic particles in the water. This technology was patented in 1987 by Fluid Treatment Inc. creating a brand new approach to water filtration. This second stage of filtration can reduce the presence of chlorine by as much as 99% while reducing the use of silver during filtration which has been banned by the EPA.
Stage 3: Adsorption: Granulated Activated Carbon - Granulated activated carbon (GAC) is utilized during the third stage to filter out herbicides, pesticides and industrial chemicals commonly found in the water supply. Carbon’s permeability allows for incredible rates of adsorption and when combined with the two other phases makes KDF filters the best and safest way to filter water.
An Ezine article