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.
Know your pool's chlorine, calcium hardness, cyanuric acid, and total dissolved solids levels. Besides the pH and alkaline levels, these are also important considerations. Make sure you understand what they are and how they benefit your water. Chlorine is used to disinfect and sanitize the water.