FROG @ease strips test for SmartChlor®, Total Alkalinity, pH and Total Hardness. In 2 seconds, you can know precisely whether your levels are balanced, plus whether SmartChlor® needs replacing. Simply dip the FROG @ease Test Strip into the water, remove with the pads facing up and shake once to remove the water on the test strips. Then put it up to the color chart on the bottle and compare. If the SmartChlor® color on the strip is darker than the bottle label, the water is fine. If it is lighter, its’ time to replace the SmartChlor® Cartridge.