"Phyllis and Jim Hurley" wrote in message
...
Our cement pond runs a steady coat of dark black/bule algae that nicely
hides all colors. People have named it from time to time. Can anyone
help us out?

Thanks

Jim


If you mean 'blue algae', it can be extremely dangerous. It can occur in the
UK and if it forms in lakes etc, the authorities will ban bathing and warn
of its presence.

For more info' here is a link.
http://www.hc-sc.gc.ca/hecs-sesc/wat...reen_algae.htm

Alex