Black algae in a pool is not just unsightly. Although it isn't harmful itself, it can spread rapidly and harbor dangerous bacteria, like E. coli, that can make swimmers sick. And if it gets into the ...

Add Yahoo as a preferred source to see more of our stories on Google. It's a hot summer day and the sun is bright—perfect weather for taking a dip in your pool. You venture out to the backyard to ...

When the Lincoln Memorial Reflecting Pool turned green with algae just days after a US$15 million renovation, the U.S. government scrambled for chemicals and expensive technical solutions to fix the ...