It seems like I constantly have to add chlorine to my swimming pool. Every time I test my chlorine, it seems low (even a few hours after adding chlorine). What can I do?

I would first make sure that you are testing the total chlorine AND free chlorine. If they are not the same reading, you may have a chlorine lock. If the chlorine levels are the same, I would check the pH, alkalinity and cyanuric acid levels.
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