Free Chlorine Vs Total Chlorine Spa. But it’s when you have algae or some other problems going on that the total chlorine levels are useless without knowledge of the free chlorine. The safe level of chlorine in pool water.
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Most spa chemical test strips will measure total chlorine. Since the purpose of adding chlorine to your pool is to sanitize the water you want to make sure your free chlorine remains higher than your combined chlorine. Total chlorine is the total of combined and free chlorine.
You need to know the safe level of chlorine in pool water to avoid the health risk.
Your free chlorine and your combined chlorine are added together and the result is your total chlorine (tc). For example, if your free chlorine levels and total chlorine levels are the same, then there’s no combined (or used chlorine) in your water. Another way to find the combined chlorine level is the difference between the total chlorine and the free chlorine levels. When breaking down chlorine, there is a simple equation to calculate total chlorine:
