The White House’s latest effort to kill off algae in the Lincoln Memorial Reflecting Pool involves a whole lot of bleach.Park workers outfitted in hi-vis vests were spotted dumping gallons of hydrogen peroxide into the Reflecting Pool Tuesday morning. A close-up of their equipment revealed that they were using a 12 percent concentrate, a level that can cause problems if inhaled and burns if the chemical touches the skin, according to the Centers for Disease Control and Prevention.Hydrogen peroxide is generally considered less environmentally destructive as its compounds readily break down in water, but the high concentration could nonetheless pose a risk to some of the pool’s frequent visitors, such as ducks or other birds.Records indicate that the Trump administration spent at least $14.8 million renovating the Reflecting Pool—a project that was, apparently, all for naught. (As well as a far cry from the president’s original promise of a $1.8 million price tag.)The project wrapped earlier this month to praise from Donald Trump, who celebrated its “beautiful, clean water” following the overhaul. The job involved painting the bottom of the memorial a color that Trump has described as “American-flag blue” ahead of the country’s semiquincentennial anniversary.But within days, the relentless algal bloom was back—almost in full force—thanks to Washington’s hot and humid weather. By the weekend, the green, plant-like form had coated the bottom of the pool in several areas and floated to the surface.Photojournalists also snapped shots of buckets of Induclor around the memorial, a chlorine compound used to control bacteria, algae, slime, and fungi in water, reported The Washington Post.Fixing the Reflecting Pool is a headache that’s plagued pretty much every administration since its construction in 1923. What makes the Reflecting Pool beautiful is exactly what makes it so difficult to maintain. The pool’s expansive length is possible due to the use of multiple large concrete slabs as its bottom. But those slabs are also prone to serious structural leaks, which requires the White House to replace roughly 16 million gallons of water each year. And the pool’s shallow depth—which creates its mirror-like appearance—also detracts from the pool’s health by creating a breeding ground for algae blooms that turn the water green.