Salary. The Bureau of Labor Statistics reports that marketing managers in the United States earned an average annual wage of $126,190 as of May 2011. The median wage, or midway point between the lowest and highest salary, was $116,010 per year.
What is TDS. TDS is the total of all dissolved solid matter such as minerals, metals, salts and. contaminants in the water. B. How TDS is Determined. TDS is most often determined in pool and spa water by using a conductivity meter. These. electronic meters measure the waters' ability to conduct an electric current.
Distilled water has a TDS level of 0, drinking water has a TDS of under 500 ppm, and sea water can be as high as 35000, but what about pool water? There are varying opinions on what level of total dissolved solids is too high for swimming pools.