Fallen leaves, died off water plants and excrements of fish can increasingly pollute the pond bottom. Lack of oxygen will acidify the pond soil, whereas decomposition of organic sludge is no longer possible. The water plants will no longer grow and algae will gain the upper hand. Bio-Oxydator removes sludge from the pond bottom and will prevent new sludge from forming. Use Bio-Oxydator in October and March, or when sludge forms. Use 4 to 5 tablespoonfuls per square metre of bottom surface area. Distribute this amount evenly in the pond and repeat after two weeks. Remove leaves and dead plants. Provide the fish with good quality feed. The less waste in the pond, the less chance of algae in spring.