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The pH strip is used for the determination of pH. The four colors on each strip correlate to. a pH range of 0 to 14. In the presence of fluid with normal pH (7.0), the strip willshow. the four colors of yellow-orange, orange, olive green, and yellow. In the presence of acidic. fluids (pH 5), the strip will display the four colors of yellow-orange, orange, tan and. yellow. The pH of gastric fluid is normally acidic.
using the test strips from the pool supply store should be sufficient for testing get the strips that show the chlorine alkaline ph and cyanuric acid find an area away from the skimmer and the returns and with the strip in hand submerse about 18 inches into the water for about 10 seconds