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.
As the pool is being refilled, more calcium is being added through the tap water, and thus the concentration of calcium in the swimming pool increases. The level of total dissolved solids (TDS) in the pool is not as important as that of calcium hardness. TDS is usually used as a tool to determine the general condition of the pool water in terms of how many dissolved particles are present.