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Interpet Pond Sludge Buster is an advanced blend of freeze-dried bacteria & enzymes that will actively consume the sludge that accumulates on the bottom of the pond. Left alone this sludge will harbour fish pathogens & detract from the water quality. The bacteria selected for Sludge Buster utilize Oxygen locked up in the sludge therefore they do not impact the level of Oxygen available to livestock in the pond. Each sachet contains 8500 bacteria! ideal to be used after treatment with Green Away or Pond Balance