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TOTAL DISSOLVED SOLIDS <br /> NaCl . <br /> Parts Per Million -ppm <br /> 0 300 600 900 1200 1500 <br /> 75 to 105 Ft. 671 pm <br /> 112 to 145 Ft. 898 ppm <br /> 145 to 169 Ft. 898 ppm <br /> 0 300 600 900 1200 1500 <br /> TDS Classes <br /> Class 1: Excellent to Good—Less than 700 ppm <br /> Class 2: Good to Injurious—700 to 2000 ppm <br /> Class 3: Injurious to Poor—More than 2000 ppm <br /> NaCl = Sodium Chloride <br />