Why is newly renovated Reflecting Pool in Washington DC full of algae? (opens original article in a new tab)

The Lincoln Memorial Reflecting Pool in Washington DC has turned green with algae days after being refilled following renovations, with ongoing algae issues dating back decades.

• Lincoln Memorial Reflecting Pool turned green with algae after renovations
• President Trump ordered the pool's revamp, blaming President Biden for its poor condition
• Algae issues in the pool have persisted for decades