President Donald Trump this year spent millions to put a special coating on the pool he said would stop the algae. In the past week, the algae returned. On Tuesday morning, national park staff were videotaped pouring hydrogen peroxide into the pool. Mixing peroxide and chlorine into water can cause a chemical reaction that sanitizes the pool just like a swimming poolCBS News reporter Bob Kovach filmed and posted on X. A New York Times report from May walks through why this isn't going to work...

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