What renovations has the Reflecting Pool in US undergone over the years?

The Lincoln Memorial Reflecting Pool in US underwent a $34-million restoration between 2010-2012 to raise it above the marshy ground beneath it after it had sunk, leading to cracks and leaks. However, it continued to leak and saw significant algae growth. US President Donald Trump's administration recently spent $14.7 million on the algae problem and painted the pool "American-flag blue".