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Chlorine specifically or all types of sanitizers. You need to have a sanitizer to keep the water clean. Chlorine and Bromine are the two most popular. There is other less common sanitizers. And remember, using a salt system does not mean you don't have chlorine. A salt system uses the salt to generate chlorine in the water.

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15y ago
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Q: What are the pros and cons of chlorination in swimming pools?
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