"Shortwave Sportfishing" wrote in message
...
On Sat, 23 Sep 2006 17:02:01 -0400, " JimH" not telling you @
pffftt.com wrote:

They multiply quite fast and can cause havoc with water intake pipes. For
example, they can clog water intake pipes at our municipal water plants on
Lake Erie, as well as cooling water intakes for our electric generating
plants. They are also can clog cooling water intakes on I/O's when the
motors are not run regularly. Lastly, they cause pretty nasty cuts on
your
feet if you step on them while wading through the water.

So why not just clean them on a regular basis?

They do. But the result is an extra maintenance cost.