The chatter is that Antifa dumped algae into the reflecting pool after renovation. There are photos of large chunks of blue plastic liner at have separated from the bottom of the pool. If true, the "residual" algae explanation is incomplete. I have no proof this is true, but the following plastic-digesting algae may be an interesting point of research.
Researchers discover freshwater algae that can 'eat' plastic waste
May 2026
Scientists at the University of Madras in Chennai have discovered a microscopic freshwater alga that can effectively break down some of the most stubborn plastics polluting our waterways. Their research reveals that a specific strain of microalgae called Uronema trentonense can degrade up to 27% of high-density polyethylene (HDPE) and 21% of low-density polyethylene (LDPE) over 12 weeks. These are the highly durable plastics commonly used to make milk packets, shampoo bottles, and everyday grocery bags. Driven by the urgent need to address the global crisis of single-use plastic waste accumulating in lakes and rivers, the research team isolated these algae from plastic debris in a local lake and exposed them to common household plastics in a laboratory setting to observe their remarkable plastic-eating abilities.
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When Uronema trentonense attach to the unnatural, water-repelling surface of the plastic, they experience severe environmental stress. In response, they alter their internal cellular metabolism and produce a thick, protective shield of sugars and proteins known as extracellular polymeric substances. At the same time, the algae generate reactive oxygen species, which are highly reactive molecules that cause oxidative damage to the plastic's surface. This effectively weakens the strong chemical bonds of the polymer chains. Once the plastic's outer defence is damaged, the algae release specialised lipase-like enzymes.
These enzymes act like microscopic scissors, cleaving the complex plastic polymers into simpler molecules like fatty acids. The algae then absorb these smaller molecules, essentially digesting the plastic waste and converting it into energy stored as cellular lipids.
https://researchmatters.in/news/researchers-discover-freshwater-algae-can-eat-plastic-waste