THE ROLE OF TOTAL DISSOLVED SALTS (TDS) IN ASSESSMENT OF WATER QUALITY

The only information obtained from a TDS meter or measurement is,
as the name implies the following:

  • TDS is a measure of the Total Dissolved Salts in the water and
    sometimes also incorrectly stated to measure the Total Dissolved Solids. 
  • The correct scientific definition of the TDS measurement is in fact the
    determination of the Total Dissolved Salts. 
  • The important information obtained from this analytical measurement is very
    plain and simple, how much mineral salt is dissolved in the water under investigation. 
  • No other information can be obtained or deduced from the simple TDS analytical test.

Please take note that TDS is but one of the 20 analytical parameters
required to gauge the quality of a water source.


The problem with the sales people is that they say that the TDS meter is showing you that the water is dirty, impure (in the sense of unsafe to drink) which is simply not true.