Standard Method # 2540. Total Dissolved Solids refer to the amount of physical matter dissolved in water. Determination of the "solids" content is important for both aesthetic and practical reasons. Drinking water with a high solids content can have a disagreeable palatability. Water with high mineral content can cause heavy deposition and be unsuitable for many industrial applications. AccuSPEC prepared Total Dissolved Solids standard values are expressed as a concentration of KCl. Exact values are dependant on the aliquot taken for the analysis. Use peCHECK Mineral Standard as a performance evaluation standard in conjunction with AccuSPEC Standards.