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.
The pool has circulation filters: water out and clean water back in. It also contains cleaning agents like chlorophyll and flouride. Large hard substances need to be taken out with a screening device that will pick up the substance but let the water through. This is especially necessary if someone defecates in the pool.