Green Pool Mystery: Nature's Fixes Outshine Chemicals

The Lincoln Memorial Reflecting Pool turned green with algae shortly after a significant renovation, prompting a scramble for chemical solutions. However, experts advocate for nature-based approaches that work with ecological systems.

The pool's shallow depth, combined with a new darker blue paint that absorbs more heat and refilling with nutrient-rich water, created ideal conditions for an algal bloom.

Scientists highlight that temporary fixes like chemicals can harm beneficial aquatic organisms. Instead, they propose solutions such as introducing zooplankton, like Daphnia (water fleas), which graze on algae, and planting rooted aquatic plants that absorb excess nutrients.

These natural methods are more cost-effective and environmentally friendly, promoting long-term water quality maintenance without the risks associated with chemical interventions.