Types of Algae in a Pond or Water Feature and Step-by-Step Treatment Process

Algae are tiny plants that can cause problems in ponds and water features when they grow uncontrollably. While some algae are beneficial and essential for a healthy ecosystem, an overgrowth can lead to aesthetically unappealing water, foul odors, and potential harm to aquatic life. In this blog, we will explore the different types of algae commonly found in ponds or water features and outline a step-by-step process to manage and treat them effectively.

Types of Algae in a Pond or Water Feature

Types of Algae:

1. Green Algae (Chlorophyta):

Green algae are the most common type found in ponds or water features. They appear as a slimy, bright green film or mats on the surface of the water or submerged on rocks and plants. Though they do not pose a direct threat to fish or wildlife, their presence can disrupt the balance of the ecosystem.

Green algae thrive in nutrient-rich water and abundant sunlight.

2. Blue-Green Algae (Cyanobacteria):

Blue-green algae, often referred to as pond scum or blanket weed, can be toxic and harmful to humans, pets, and wildlife. They appear as dark blue-green or brownish mats or patches on the water’s surface. When left uncontrolled, blue-green algae can deplete oxygen levels in the water, leading to fish kills and other adverse effects on aquatic life. They thrive in warm, still water, particularly when nutrient levels are high.

3. String Algae (Filamentous Algae):

String algae are long, hair-like strands that form dense mats in ponds or water features. They can be green, brown, or gray in color and are often found clinging to rocks, plants, or other structures. String algae can smother aquatic plants and fish, disrupting the delicate balance of the ecosystem. Filamentous algae often indicate poor water quality, excessive nutrients, and sunlight.

Step-by-Step Treatment Process:

1. Identify the type of algae:

Before proceeding with treatment, it is crucial to correctly identify the specific type of algae present in the pond or water feature. This identification will help determine the appropriate treatment methods.

2. Evaluate water quality:

Assessing water quality is essential because algae thrive in nutrient-rich environments. Test free-floating nutrients, such as phosphorus and nitrogen, as well as pH levels. Identifying imbalances will aid in developing a more effective treatment plan.

3. Remove excess organic matter:

Decaying leaves, grass clippings, and other organic debris contribute to nutrient build-up. Regularly remove floating debris from the pond or water feature to minimize nutrient levels that can support algae growth.

4. Improve pond plant coverage:

Having a variety of pond plants, such as water lilies, floating plants, and submerged plants, can provide natural shade and competition for nutrients, reducing algae growth. It is crucial to maintain a variety of floating and submerged plants throughout the pond.

5. Mechanical removal:

For faster and visible results, manually removing visible algae with a net or pond vacuum can help control the overgrowth. Be cautious not to disturb the natural balance or harm aquatic life while performing this task.

6. Introduce beneficial bacteria:

Using beneficial bacteria products designed for ponds can enhance water quality by reducing excess nutrients. These bacteria consume organic matter, converting it into harmless byproducts. Follow the manufacturer’s instructions for proper dosage and application.

7. Chemical treatments:

If algae growth is excessive or persistent, it may become necessary to use chemical treatments. Consult with a professional or local garden center to determine the most suitable algaecide for the specific type of algae present. Follow the instructions carefully to ensure safe and effective application. Always consider the potential impact on aquatic life when using chemical treatments.

8. Limit sunlight exposure:

Excessive sunlight promotes algae growth, especially in warm weather.

Install shade sails, pond covers, or plant larger trees nearby to provide shade. Reducing sunlight

Published On: July 19, 2023

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My family and I were looking to do something different with the hillside portion of my landscape. It was nothing other than native grass, difficult to maintain, and really just lacking any backyard appeal for the size of landscape that I have. We were leery of Colorado landscapers. One company wanted to remove and or move existing shrubs and plantings to move in equipment (for some reason, they refused to use the readily available open space). Other companies refused to itemize their quotes and tell us exactly what they were planning to put in our backyard (to me it seemed like they didn’t want the customer to see how the amount of product lined up (or didn’t line up) with projected costs). I basically just halted the process and waited an additional year to move forward on the construction of a pond. When I did move forward it was with BR&D.

I found BR&D from Aquascape. They came highly recommended, and seemed like a good local company to partner with. When I first met Brett (Owner) and Tyler (Senior Foreman) at my home, I was extremely relieved at not getting a lofty sales pitch. They were much more interested in what they could carve out in my landscape, what I would be happy with, and actually went into detail about the maintenance involved in the various options we talked about for about an hour and a half. I hired them on the spot, and I couldn’t be more happier with the results. The company is very detail oriented. Tyler is a perfectionist. There was always a senior member of the company present on my project; everyday, without fail. The products that were used, were as promised, and the installation of those products was checked, double checked, and checked again, daily, until closeout of the project. We do a lot of landscaping ourselves and hence was pretty much in the landscape on a daily basis while the pond construction was in progress. Rather than get annoyed at that, BR&D seemed to get more excited about the project and used the time to give us tips, and further explain details of remaining phases of construction. My pond has run consistently without fail for a year now. That includes through the winter where temperatures dropped to around -20F in my area. I am the only person in my neighborhood that has had a pond running consistently through fall, through spring, through summer, and completely through winter.

I’d also like to point out that communication with the company has been nothing short of A+. This is a busy company, but they make you feel like you’re their highest priority when you have an issue. The company has responded to my queries on weekends and times that I would consider outside of standard business hours. One thing I’ve never heard from BR&D is “it’s your fault”. This company has never accused me, the customer, of doing anything in an effort to remove themselves from a situation. They have simply addressed all of my concerns – in some cases in less than 24 hours. As a new pond owner I’ve definitely made mistakes, but BR&D, have offered encouragement, and education on how to keep a stocked pond thriving, without any attempts to sell services. They turned a rather large useless portion of my landscape into something spectacular. They are into the art and science of what they do; the group deserves good clients, that are serious about what they want to build. I would highly recommend contacting and contracting BR&D for your landscaping needs. In my experience, they are a rarity in Colorado.

Joseph Lawson

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