Why is newly renovated Reflecting Pool in Washington DC full of algae?

The Lincoln Memorial Reflecting Pool has turned green with algae shortly after being refilled following renovations ordered by President Donald Trump. The pool has faced recurring maintenance issues with algae for several decades.
Why it matters
The incident highlights ongoing maintenance challenges for iconic national monuments and has become a point of political friction between the current and former administrations.
The Lincoln Memorial Reflecting Pool in the US capital has turned green with algae days after it was refilled with water following renovations.
The article reports on a physical maintenance issue while neutrally noting the political context of the renovation orders.
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