Green Water Clearer Pond 125ml (formerly Conditioner & Clearer Pond)Green Water Clearer helps to condition water and clear unsightly green matter. When used strictly as directed, it is harmless to filter systems and can be used without harmful effects to fish or plants. Directions: Add 10ml to 600 litres of water. For severe cases, use 10ml to 300 litres. This should clear water over approximately 3 to 10 days. To prevent green matter recurring, repeat dose every 5 to 6 weeks or when necessary.