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.
At times it comes to a point when you have to drain your pool. It could be for maintenance or to replace the water after so many years of use. Over the years, the (TDS) Total Dissolved Solids level in your swimming pool accumulates to a point where it becomes hard to maintain the chemistry.