Work crews have poured hydrogen peroxide into the newly repainted Washington's Lincoln Memorial Reflecting Pool to combat an algae bloom, a little over a week after it was repainted "American flag blue".
National Park Service workers were seen emptying jugs labelled "12% hydrogen peroxide" into the green water of the nearly century-old basin that stretches between the Lincoln Memorial and the Washington Monument on the National Mall.
A spokesperson for the Interior Department said the pool is being treated with "high-tech nanobubble ozone technology" that kills algae, pathogens including E coli, and other contaminants. The department said hydrogen peroxide is also being used, saying it's "a milder treatment than chlorine" that is used in spas and natural swimming pools.