Add Yahoo as a preferred source to see more of our stories on Google. U.S. National Park Service employees are pictured using a vacuum pump to clean algae off the bottom of the newly repainted Lincoln ...

Algae is an unfortunate possibility when it comes to pools, and may be a sign that your pool is in dire need of a cleaning. Spores blown in on the wind or leaves, twigs, and dirt falling into your ...

WASHINGTON (AP) — President Donald Trump’s remodeled Lincoln Memorial Reflecting Pool with its “American flag blue” bottom has turned chartreuse from an algal bloom that park service workers struggled ...

A young woman sits on a wooden deck and dangles her legs into a green, algae-filled swimming pool in a backyard. - Alyssum/Getty Images Algae is an unfortunate possibility when it comes to pools, and ...