What Makes Pool/Spa Water Change Color and How To Fix

Have you ever added your normal shock treatment then watched in horror as your pool or spa turned purple, black, red or green? You are not alone. This is actually a very common occurrence and usually indicates that there are minerals (metals) in your pool. The change in color is caused by a chemical reaction that occurs when the chlorine/shock oxidizes the metals in your pool water. The following steps can be used as a guide to help you clear...

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