Pool Operator's Test Questions and Answers, Already Verified Study Guide.
Pool Operator's Test Questions and Answers, Already Verified Study Guide. phenol red used to measure pH parallel valves are open if handle is ______ to the pipe pH how acidic or basic a solution (pool water) is 60 to 180 acceptable range of Total Alkalinity in a pool 7.2 to 7.8 acceptable range of pH in a pool 150 to 400 acceptable range of calcium hardness in a pool 1500 maximum reading for total dissolved solids (TDS) 7.5 pH of a human eye 15 minutes maximum time someone should spend in a spa
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