The National Park Service is using hydrogen peroxide and “nanobubbles” to treat algae that’s been growing in the Lincoln Memorial Reflecting Pool since the water feature was refilled last week after a multimillion-dollar renovation.
“To keep the water in the Reflecting Pool not only crystal clear but also clean, we are deploying high-tech nanobubble ozone technology,” the U.S. Department of the Interior said in a statement to 草莓传媒 on Tuesday. The department added that hydrogen peroxide, “which is a milder treatment than chlorine and is used in spas and specialty pools like natural swimming pools, is also treating the pool.”
An spokeswoman for the agency said Monday that the Reflecting Pool’s new green tint was “residual” algae from the water pumps and pipes.
Videos posted on social media beginning Tuesday morning showed workers pouring bottles of hydrogen peroxide into the water.
“There are no harmful side effects to marine life or to the environment,” the Interior Department said.聽
The Interior Department added that the nanobubbles treatment was “actively killing algae, pathogens (e.g., E. coli), and contaminants that have long plagued the Reflecting Pool since 1922.”
The Trump administration said that Reflecting Pool renovation costs are around $14 million.
As of late Tuesday afternoon, the water closest to the Lincoln Memorial turned a blue-gray color, 草莓传媒’s Alan Etter said. The east side of the Reflecting Pool near the World War II Memorial remained bright green as crews poured chemicals and strained the water by hand.
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