How to Treat and Control Pond Algae

Algae in ponds are a natural part of any healthy pond ecosystem. However, when green algae in ponds becomes excessive, it can turn your once clear and tranquil water feature into a murky, green mess. The key to maintaining a balanced pond is not to eliminate algae entirely but to control algae on ponds to a manageable level. In this guide, we’ll explore how to treat and control both floating algae in ponds and string algae, along with practical algae prevention in ponds to ensure a clean and healthy water feature.

Understanding Pond Algae

Before diving into treatment methods, it’s essential to understand that algae in ponds comes in two primary forms:

1. Suspended Algae: These are single-celled algae that float freely in the water, often turning it green and cloudy. This type of green algae in pondsis commonly referred to as “pea soup” due to its murky green appearance.
2. String Algae: Also known as filamentous algae, this form grows in long strands and attaches to surfaces like rocks, plants, and pond equipment.

Both forms of algae on pond surfaces thrive in environments with excess nutrients and sunlight. Proper pond management involves keeping these factors in balance.

Treating Suspended Algae

Suspended algae, or floating algae in ponds, can cause water to turn green and unsightly, but there are several ways to manage and control its growth effectively.

1. Use Algaecide

For immediate relief from green algae in ponds, consider using an algaecide, such as Aquascape Algaecide. This treatment quickly eliminates suspended algae blooms, helping to restore water clarity. Always read and follow the application instructions carefully. For better results, especially in warmer weather, consider adding a pond aerator to enhance oxygen levels and reduce the risk of rapid algae growth.

2. Install a UV Clarifier

If green floating algae in southern USA or other regions is a persistent problem, adding a UV Clarifier can be a long-term solution. Devices like the Aquascape UltraKlear® UV Clarifier use a high-output UV bulb to eliminate single-celled algae as the water passes through the system. UV clarifiers are effective in preventing and controlling floating algae in ponds without the need for chemical treatments.

3. Improve Filtration with a Pond Filter

Proper pond filtration is crucial for balancing the water and preventing algae on ponds. If your pond lacks sufficient filtration, adding a filter like the UltraKlean™ Pond Filter can help. This filter not only traps debris but also includes a UV bulb that eliminates suspended algae, providing clear water and a healthier pond environment.

Treating String Algae

String algae, or filamentous algae, can be more challenging to deal with due to its tendency to cling to rocks, plants, and other surfaces. However, there are several methods to treat and prevent algae in ponds that grow in this form.

1. Use Contact Granular Algaecide

To eliminate string algae directly, use EcoBlast™ Contact Granular Algaecide. This product can be sprinkled onto the affected areas, such as rocks and waterfalls, and works quickly to remove unsightly algae on ponds. It’s effective in all water temperatures, and for best results, turn off the water feature before applying the treatment.

2. Install an IonGen™ System

For more persistent issues with string algae, consider installing an Aquascape IonGen™ System G2. This system uses a microprocessor-controlled ion-producing probe to kill and prevent filamentous algae in pond growth. The IonGen™ system is compatible with ponds containing fish and plants, and it’s a cost-effective solution for long-term algae prevention in ponds.

Preventing Algae Growth

Prevention is the best long-term strategy for controlling algae ponds. By managing sunlight exposure, nutrient levels, and water quality, you can stop algae in ponds from taking over.

1. Manage Sunlight Exposure

Excess sunlight can encourage the rapid growth of both suspended algae and string algae. To reduce sun exposure, add aquatic plants such as water lilies, which provide shade on the pond’s surface. Floating plants like water hyacinths are also effective in shading the water and reducing green algae in ponds.

Additionally, planting marginal plants such as water iris, pickerel, and aquatic mint around the edges of the pond can provide further shade and compete with algae in ponds for nutrients.

2. Control Nutrient Levels

Algae in ponds thrive on nutrients in the water, particularly from fish waste and uneaten food. To prevent excess nutrients:

• Avoid overfeeding: Feed your fish only the amount of food they can consume in five minutes. Remove any uneaten food after feeding to prevent nutrient buildup.
• Avoid overstocking fish: A common mistake is having too many fish in the pond, which can lead to increased waste production. As a rule of thumb, allow at least 10 gallons of water for every inch of fish in the pond.

3. Check for External Nutrient Sources

Nutrients from outside sources, such as lawn fertilizers or stormwater runoff, can also contribute to what causes algae in ponds. Ensure your pond is protected from these sources by checking for leaks or runoff paths that might introduce unwanted chemicals or nutrients into the water.

It’s a Balancing Act

Controlling algae ponds is about maintaining balance. Excess nutrients and too much sunlight are the main culprits behind rapid algae growth. By managing these factors through proper pond care, filtration, and prevention methods, you can keep algae on ponds in check and enjoy clear, healthy water.

Conclusion

Algae in ponds are a natural part of any aquatic ecosystem, but when left unchecked, they can become problematic. By understanding the types of algae—suspended algae and string algae—and implementing effective treatments such as algaecides, UV clarifiers, and pond filters, you can restore your pond’s balance. Additionally, proactive measures like managing sunlight exposure, controlling nutrient levels, and adding aquatic plants can stop algae in ponds from overgrowing.

With the right combination of treatment and prevention, you’ll be able to keep your pond clear, healthy, and a beautiful part of your outdoor space year-round.