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.
What is worse is the corrosion process dissolves some of the metal into the pool water. For parts that contain copper, like metal piping in older pools and copper heat exhangers in pool heaters, small amounts of copper from these surfaces will be released into the pool water.