Identify the Type of Algae

Before attempting to get rid of algae in a large pond, it is important to identify the type of algae present. Algae are classified as either planktonic or filamentous. Planktonic algae are often green in color and float freely in the water. This type of algae can be easily skimmed off the surface. On the other hand, filamentous algae are green-black strands that cling to rocks and other surfaces in the pond.

Increase Circulation and Aeration

Algae grow and thrive in stagnant water with low oxygen levels. To reduce algae growth, it is important to increase circulation and aeration in the pond. Use a submersible pump to create a waterfall or fountain to help increase water movement and oxygen levels.

Reduce Nutrient Levels in the Pond

Nutrients such as phosphates and nitrates are essential for algae growth. To reduce the amount of nutrients in the pond, it is important to reduce the amount of organic debris that accumulates in the bottom of the pond. This can be done by regularly cleaning the pond and removing any dead plants or leaves.

Utilize Biological Controls

If the algae is not too thick, it can be managed through biological controls. Introducing fish to the pond can help to reduce the amount of algae in the water. The fish will feed on the algae and help keep the population under control.

Consider Chemical Treatments

In some cases, chemical treatments may be necessary to get rid of algae in a large pond. Common chemical treatments include copper sulfate, potassium permanganate, and hydrogen peroxide. These treatments should be applied carefully and in accordance with the manufacturer’s instructions.

Getting rid of algae in a large pond can be a challenge, but with the right approach, it is possible to manage the problem. Identifying the type of algae present is the first step. Then, increase circulation and aeration, reduce nutrient levels in the pond, utilize biological controls, and consider chemical treatments to keep algae growth under control.