Deionized Water

What is Conductivity and how is it measured?

Water purity is most often measured by testing the level of electrical conductivity of the water.  This is a fairly simple test which measures a material’s ability to conduct an electrical current.  By passing a small charge across a substance (in this case water) it is possible to measure any impurities that are present.  This is done in laboratories using a piece of equipment called, quite fittingly, a conductivity meter.  In theory, totally pure water would not conduct any of the charge passed through it; it would have total resistance to the current.  Resistivity is the opposite to conductivity.  Electrical Conductivity is measured as Siemens per cm (S/cm) at this low level of measurement however the figures obtained would be given as microsiemens per cm (µS/cm).  One microsiemen is one millionth (10-6) of a Siemen.

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Measuring the electrical conductivity will not indicate what exact impurities are present in the water, but it does give an accurate way of indicating the water quality overall.  By using various purification processes, ordinary mains tap water can be purified to such a degree that only very small trace elements remain in the water.  These processes include Distillation, Ion Exchange Deionisation, Microporous Filtration and UV Radiation amongst others.  At The-Water-Company.com, we use all of these methods, with the exception of distillation.  The distillation process is not as effective as deionization where water quality is concerned.