Blanket Weed
 

After 15 years with no problems, our small pond has suddenly become heavily
infested with blanket weed. We pull out armfulls but it grows back in a
few days. I've seen remedies advertised but I would first like to hear
from someone who has tried them. We have lots of wildlife and I don't want
to harm anything. Apart from the blanket weed the water is clear and
healthy.

- Arthur