What Are Those Algae in Your Pool?
Your swimming pool algae, together with kelp, pond scum, and lake bloom, are all part of a gigantic family of more than 100,000 organisms that live in freshwater or on wet surfaces of almost any kind.
They’ve existed for 3.5 million years in various shapes and guises. Some are gigantic, hundred-foot-long kelp; others are microscopic organisms. They all thrive on warmth and light and food. Which makes their lives easy in the Sunshine State: it’s plenty sunny and warm, plus algae feed on almost anything, from other microscopic organisms to mere specks of dirt.