Blanketweed
 

Jim,
We call it string alage here in the states, but whatever its called its very
annoying. So far I have never found anything to get rid of it, except using a
toilet brush to grab hold of it and pull it loose. Some people here on rec
ponds have used kitty litter but I have never tried it. Good luck!!
Jan
"Our Pond" Page
http://hometown.aol.com/pinkpggy/index.html