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  Pip Howard October 8, 2009 at 10:00am

  I was head gardener on an estate where we had this problem on series of large ponds; we tried everything, spoke to consultants etc etc. The only solution was netting, or we actually used a plastic greenkeepers rake tied to a piece of string. It was labourious but was the only satisfactory solution. We soon realised that the day after strong winds would allow accumalation of the weed on one side making it much easier to remove. The really important factor was removing the weed a significant distance away from the ponds afterwards.
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  ben ranyard October 8, 2009 at 1:27pm

  I use the rake trick too...really quite good fun to in a big pond....however by fay and away the best way is to invest in a pair of waders and get into the pond. The weed made excellent compost if I remember.
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  Chris Carr October 8, 2009 at 2:44pm

  There is a microbial product which is available from Soil Harmony E Mail my mate Mark at mark@soilharmony.co.uk the product is fish friendly
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  Anthony Toop October 10, 2009 at 11:46pm

  One method i've used before is to get a wet and dry vacuum cleaner and just touch the waters surface and try to suck up as much duckweed with as little water as possible, obviously this is only viable in a smallish pond with good access, but its worked a treat for me quite a few times in the past, can get tedious mind.
  Trouble with duckweed, unless you get every last piece it will just multiply again, you really need to try and clean it up over several visits, preferably every other day until successful!