Blanket answer is a unique blend of minerals and enzymes that succeeds where many commercial bacterial cultures fail - IT WORKS! Safe for use with all pond fish, plants and does not adversely effect biological filter systems. To apply, mix Blanketweed Answer with water in a watering can and pour evenly over the pond surface. The water will initially take on a milky white appearance, but this will clear in a few days. The pond should have a good level of oxygen saturation as the breakdown of the algae will involve some reduction in oxygen levels. 800gm bottle treats up to 10,000 litres (2,200 gallons)