As the Lincoln Reflecting Pool turned green with algae, officials are now using chemicals to fix it.

President Donald Trump’s more than $14 million Lincoln Memorial Reflecting Pool renovation was completed just over a week ago, with its more than 300,000 square feet refilled with 6.5 million gallons of clean water.

The Washington Monument is once again visible in the refilled pool, but Trump's vision of an azure expanse between the D.C. landmarks has been complicated by the harsh realities of chemistry and biology known to any backyard pool owner.

Workers are now deploying hydrogen peroxide in a bid to bring an algal bloom under control in the Lincoln Memorial Reflecting pool. The cause of the pool turning green is an algal bloom, which has happened following the renovations of the historical landmark.

The National Park Service is deploying hydrogen peroxide in the Lincoln Memorial Reflecting Pool to combat algae growth, according to a Department of the Interior (DOI) spokesperson. This effort follows the Trump administration’s controversial $13.

Despite a $14 million renovation, DC’s Reflecting Pool remains green with algae. CNN’s Sunlen Serfaty tested the water to find out why.