WASHINGTON, DC - JUNE 22: Machinery used for an ozone nanobubble filtration system is deployed along the Lincoln Memorial Reflecting Pool to counter an algae bloom on the National Mall on June 22, 2026 in Washington, DC. President Donald Trump said that another round of repairs to the iconic basin will begin immediately after peeling paint was seen following the completion of a recent $14 million no-bid restoration project. (Photo by Chip Somodevilla/Getty Images)