A conductivity meter or TDS pen can be purchased for at low cost on major online selling websites. These meters are deceptively presented as water quality testers, whereas they only demonstrate the water's conductivity.

The conductivity of water is directly proportional to the amount of dissolved solids in the water, that is, mineral salts in their ionic form (and not organic matter or various pollutants). Thus, the higher the concentration of dissolved minerals and trace elements, the higher the conductivity.

These devices cannot detect the presence of pollutants or contaminants, nor can they make a conclusion about the purity of the water.

The concentration shown by these meters before filtration corresponds only to the content of dissolved minerals in ionic form in your water.

Finding the same measurement before and after filtration indicates that the mineral salts were not retained, which is the goal of Berkey® filtration. This measurement in no way questions the efficiency of Black Berkey® or Sport Berkey® filters and is not proof of malfunctioning of your purifier.

If your measurement is higher after filtration, this means that the filters have not been cleaned properly and that some residual dust remains after the filters have been machined. It will tend to decrease over time.

For further details, you can read the full article on our BLOG.