For the more discerning pool owner who wishes to test for additional parameters. Blue Horizons 6-Way Test Strips provide a quick and easy way to test your swimming pool water. They offer tests for free chlorine, total bromine, pH, total alkalinity, calcium hardness & cyanuric acid. Simply dip the strip in the water and remove immediately. Hold horizontally for 10 seconds (do not shake excess water from the strip), then compare pads against the colour chart on the test strip bottle.