Key Features Effectively treats and removes unwanted algae Safe for fish, pond life and plants Simple and easy to use Quick acting treatment for green water 2.5 Litre Green Algae, or green water, can look unsightly in a pond and makes it increasing difficult to view and monitor the fish within the pond. The Green algae can cause damage to the ponds pump and filter system which in turn can reduce their effectiveness, and ultimately could cause your equipment to breakdown. Banish Pond Green Water is a highly effective and quick acting treatment that can easily and safely remove the green algae without presenting any danger to the fish or live plants within the pond.