Key Features 1 litre bottle Harmless to all fish, plants, wildlife, and filters Effective treatment for green water Maintain healthy environment for fish and pond life Easy to use with handy measuring gauge Interpet Green Away is not an algicide, therefore does not pose a problem to your pond’s ecological system. It works by clumping together the single cell algae that causes green water and making it sink. Harmless to all fish, plants, wildlife, and filters. Ideal follow up is Sludge Buster. Specifications 1 litre treats: 20000 litres (4400 gallons).