"Bob Hobden" wrote
Caused by Algae, the cure is not to introduce any more fertilizer (tap
water) and to cover most of the pond surface with something else like a
Water Lily. There are ones for almost any depth of pond so you should be
able to find one for yours although specialists in water lilies are rather
rare...
This is one I have used in the past and they have a comprehensive stock
especially if you visit ....
http://www.lilieswatergardens.co.uk/
or if you fancy a holiday in France the nursery where most originated from
is back up and running ...
http://www.latour-marliac.com/photoparc.php?idlangue=0

Gave you the French link, sorry, this is the English site...
http://www.latour-marliac.com/index....1&videpanier=1

--
Regards
Bob Hobden
W.of London. UK