Pool Operator's Test |45 Questions| With Correct Answers.

phenol red {Ans: used to measure pH}backwash {Ans: the reverse of flow of water through the filter tanks in order to clean the system}combined chlorine {Ans: ineffective chlorine (aka chloramines) which level is found by subtracting the free available chlorine from the total available chlorine}scaling {Ans: mineral deposits on the wall or in the pipes}30 minutes {Ans: maximum turnover rate for a spa}influent lines {Ans: lines that bring water into the system (main drain, skimmers, vacuum)}