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Why Does Algae Keep Growing In My Pond, Even After I Treat With Algaecides? | Ponds & Lakes Q&A


Q: Why does algae keep growing in my pond, even after I treat with algaecides?

Cathy – Bagley, WI

A: Algae seems to take on a life of its own sometimes, doesn’t it? Once that green slimy, stringy or seaweed-looking stuff crops up, it keeps growing and growing until you wind up with a messy situation in your pond or lake. Even if you treat it with algaecides, it still grows back.

Turns out that all these tiny plants need to grow is sunlight and food source – both of which are abundant during certain sunny times of year and when there’s a healthy mix of detritus built up along the bottom of the lake. To make things worse (or better for the algae!), when a pond is treated with chemicals, the process just adds dead algae to the pond, which is actually a food source for the growing algae.

Rather than battle this green monster after it has a foothold, it’s best to take a proactive approach. After you verify that you’re dealing with algae and not weeds (read here for a quick lesson on chara and other types of algae), we recommend you follow these four all-natural steps for preventing algae attacks:

1. Use Aeration: Aeration systems, like Airmax Aeration®, circulates debris that has accumulated in the lake or pond so it doesn’t settle at the bottom and become algae food. Aeration also spreads the debris throughout the water column, making it more accessible to beneficial bacteria that break it down.

2. Use Natural Bacteria: Natural beneficial bacteria, such as Pond Logic® PondClear™ Beneficial Bacteria, power through nitrates, breaking down fish waste, leaves and other organics that accumulate in the pond. This naturally improves the water clarity as the bacteria devour the sediment.

3. Use EcoBoost™: Pond Logic® EcoBoost™ Bacteria Enhancer is an innovative product that binds algae-feeding phosphates in ponds and stimulates the growth of essential beneficial bacteria, which are essential when controlling algae in your lake or pond.

4. Use Pond Dye: Because algae thrive in sunlight, Pond Dye filters those rays and stops them from reaching below the surface, thereby preventing algae from growing. Plus, the cool colors mask the soupy green hue of the algae.

We can’t guarantee your algae problem will disappear, but if you follow these steps you’ll be creating a pond that’s inhospitable to algae invaders.

Pond Talk: How have your algae blooms been this spring and summer compared to last year?

Airmax Aeration Systems - Even Ponds Need To Breathe

2 Responses

  1. Does the ph level impact algae? In other words, does a high ph level lessen algae growth, or doesn’t it have any impact? I am on a well and my ph is 9.0.

    • Good question, Bob. I have been told to treat my 2/3 acre pond with hydrated lime to change the ph level. It seems to shock the algae, turning it brown, but not killing it. Then treat with a copper product like Cutrine Plus. In PA, a permit is required.

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