Park Service continues to battle algae in renovated Reflecting Pool
Summary
The National Park Service is working to remove algae from the Lincoln Memorial Reflecting Pool after recent renovations caused a green algae bloom. The Department of Interior is using hydrogen peroxide and nanobubble ozone technology to clear the water and keep the pool clean.Key Facts
- Algae grew in the Reflecting Pool soon after renovations finished on June 14, 2026.
- The Department of Interior says the algae came from reactivated water supply lines.
- Workers are using hydrogen peroxide and nanobubble ozone technology to kill the algae.
- Nanobubble ozone technology releases tiny bubbles filled with ozone that fight algae.
- Park rangers are scraping algae off the bottom and removing contaminated water through tubing.
- The hydrogen peroxide treatment is safe for marine life and the environment.
- The renovation project cost nearly $15 million and updated the pool’s filtration system.
- The company Greenwater Services, paid $1.7 million, installed the new filtration technology.
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