The newly renovated Lincoln Memorial Reflecting Pool, featuring an "American flag blue" bottom, is battling a severe algal bloom that has turned its waters green just days after a $14.8 million makeover. National Park Service crews are using ozone nanobubbles and hydrogen peroxide to combat the algae, but the pool's size and use of Tidal Basin water make maintenance a significant challenge.
The Lincoln Memorial Reflecting Pool , recently renovated with a new "American flag blue" bottom as part of a $14.8 million project championed by former President Donald Trump , is facing an unexpected algal bloom that has turned its waters chartreuse.
The bloom emerged just days after the completion of the extensive renovations, which aimed to beautify the iconic Washington, D.C. , landmark ahead of the nation's 250th anniversary. Despite the efforts of National Park Service workers and contractors employing chemicals, ozone nanobubbles, and vacuuming, the algae persists, complicating Trump's vision of a pristine azure pool. The pool's scale-larger than ten Olympic-sized pools-and its source water from the often-fetid Tidal Basin present unique challenges.
The new dark-painted bottom further exacerbates the problem by elevating water temperature, creating ideal conditions for algae growth. Experts note that using untreated river water makes algae control a constant battle. The mitigation work continued Tuesday with workers wading into the pool to deploy ozone nanobubble tubes while tourists observed. The Park Service emphasizes that hydrogen peroxide, a milder alternative to chlorine, is being used to avoid harming the environment.
Some observers suggest that draining and refilling the pool with treated water may be the only long-term solution. The incident underscores the difficulty of maintaining such a large urban water feature with natural water sources and highlights the clash between aesthetic aspirations and ecological realities
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