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If you have a pool, you must know how important it is to keep the pool clean and test the chemical levels on a weekly basis. This is the only way to keep a pool safe for swimming. If you notice that the water is getting cloudy, or you start seeing black spots on the sides of the pool at the waters surface, you may have a chemical unbalance. When this occurs, you need to use a copper pool testing strip to test the chemicals. After you test the water, you can take the appropriate action to correct any unbalance.