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.
There are two methods to test the total dissolved solids in pool water. The most common and accurate method is TDS test meter. This method is working basis on conductivity. To maintain accuracy this device needs calibration. The other test method is TDS test strip method which is inexpensive and less accurate.