The presence of inorganic dissolved solids ( total mineralization) is one of the main indicators of water quality and of its properties. Total mineralization may be calculated from the results of water analysis. The results are expressed in millimols per litre or milligrams per litre. The calculated total mineralization presents a more reliable idea about dissolved inorganic solids in the water sample than the experimental determination of dissolved solids after drying at 105 ^oC or of fixed dissolved solids in a sample ignited at 550 ^oC. The significance of total mineralization in aquatic chemistry has been discussed.