The $1.7 million “ozone nanobubbler” being used in an effort to make the Lincoln Memorial Reflecting Pool water crystal clear has a unique ability to shoot 500 million microscopic bubbles into every teaspoon of water.

Trying to kill algae with chemicals is a common response when community ponds or other water features go green, but a freshwater ecologist says there may be safer and more effective solutions

President Trump's efforts to spruce up the Lincoln Memorial Reflecting Pool faced a snag this week, with algae turning the water green while rips appeared in an "American Flag Blue" surface picked by the president.

Visitors have said that the pool looks "absolutely beautiful" in the last day.

About two weeks ago, President Donald Trump said work to restore the Reflecting Pool was finished. It has since turned green and paint is peeling.

Bulky “nanobubbler” machines were carted off ahead of a promotional event for President Trump’s Ultimate Fighting Championship birthday party.

As the nation prepares to celebrate its 250th, a major topic in Washington isn’t the meaning of democracy but a shallow pool of water. Views on the Reflecting Pool, like many things, are shaped by politics.