Hydra DW-400
Use Hydra Duckweed for Duckweed Control & Elimination in your Water Garden Ponds for Beautiful Ponds Features and advantages:- A safe and natural solution for preventing the growth of duckweed. The after effects mean that once the existing infestation has been removed its return is inhibited so that the duckweed will find it very difficult to return. Can be added direct to filter or to pond. Clean, simple and easy to use. Safe for fish, plants, humans, pets and wildlife. No herbicides or pesticides are used in Hydra DW-400. Contains specific micro-organisms which starve duckweed of essential nutrients but do not slow other plant growth. For more information about Hydra DW-400 you can visit the link given below: http://hydra-aqua.com/pond-supplies-uk/hydra-dw-400.html