What is Pond Scum? How to Get Rid of It from Your Pond

If you’re a pond owner, you’ve likely encountered the slimy green layer known as pond scum or algae. It’s not just unattractive, it can also create issues for your pond’s health and ecosystem if conditions arise that lead to runaway algae blooms. In this guide, we’ll dive into what pond scum is, why it forms, how to eliminate it effectively, and offer tips on keeping your pond clean and clear for good.

At Midwest Ponds, we understand how frustrating this problem can be, so we’ll also provide product suggestions and simple solutions that work!

BEHOLD - the many and varied forms of algae!!!

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What is Pond Scum?

Pond scum is the layer of algae that collects on the surface of ponds and lakes. A vital member of your pond ecosystem, algae is an important cog in the gears of the biosphere. 

Nuisance algae largely comes in two forms:

• Filamentous algae: Also called string algae, this type creates hair-like strands that can clump together, forming floating mats.

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• Planktonic algae: This type causes the water to turn a murky green/pea soup color.

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Scum grows quickly in ponds that have high levels of nutrients (like phosphorus and nitrogen), warm temperatures, and stagnant water. These nutrients usually come from fish waste, decaying leaves, and even runoff from fertilizers used nearby. Rain events and protracted periods of hot summer weather are the usual harbingers of algae blooms.

Why Should You Get Rid of Pond Scum?

While a little algae is normal (AND IMPORTANT), too much can cause problems, like:

• Reduced oxygen levels: Pond scum blocks sunlight and uses up oxygen, which is harmful to fish and other aquatic life. The algae life cycle goes between creating oxygen and consuming it - SO too much algae at the wrong time can deplete oxygen when your larger fish friends need it the most.
• Bad smells: Algae buildup can create foul odors, especially as it decomposes. Large algal mats further stagnate water leading to a great potential for a bad smelling pond. 
• Unattractive appearance: A scum-covered pond doesn’t exactly scream “relaxing water feature.”
• Potential toxins: Some algae can produce toxins harmful to pets, wildlife, and even humans. Planktonic bloom can cause water to be poisonous in high enough concentrations. This can kill your fish and be very harmful to people in high doses.

How to Get Rid of Pond Scum: Proven Methods

Let’s talk about solutions. Here are some easy-to-follow tips to help you eliminate pond scum and restore your pond’s beauty.

1. Skim the Surface Regularly

One of the easiest ways to keep scum in check is by using a pond skimmer. This removes leaves, debris, and floating algae before they decompose and fuel more algae growth. Think of it like daily pond maintenance to keep things looking fresh.

Tip: Investing in a quality skimmer from our Midwest Ponds Pond Cleaning Tools Collection can make this process much quicker and easier.

2. Use Beneficial Bacteria

Beneficial bacteria break down the organic waste that algae feed on, naturally reducing nutrient levels in your pond. Regularly adding bacteria supplements keeps algae at bay and promotes a healthy pond ecosystem.

Fact: Studies show that beneficial bacteria can reduce nutrient levels by up to 30%, lowering algae growth significantly. You can find high-quality bacteria treatments in our Midwest Ponds Water Treatments Collection.

3. Install a Pond Aerator

Aerating your pond helps increase oxygen levels and circulation, two things algae hate. By keeping the water moving, you reduce the chances of algae settling and forming that thick scum layer.

Did you know? Aeration can reduce algae growth by up to 50%. Our Pond Aerators are designed to fit ponds of all sizes and keep your water clean and clear.

4. Control Nutrient Input

Preventing excess nutrients from entering your pond is crucial. Limiting fertilizer use near your pond and managing fish population levels will help reduce nutrient overload.

Pro Tip: Slow-release, phosphorus-free fertilizers are a better choice if you have plants around your pond. You can also consider planting buffer plants to absorb nutrients before they reach the water.

5. Add Algae-Eating Fish

Certain fish, like grass carp and koi, love munching on algae. They help keep the algae population under control without the need for chemicals.

Pros and Cons of Different Pond Scum Removal Methods:

Preventing Pond Scum for the Long Term:

Once you’ve eliminated pond scum, the goal is to keep it from coming back. Here are some long-term prevention tips:

• Monitor Nutrient Levels: Regularly test your pond’s water to ensure nutrient levels stay low.
• Shade Your Pond: Algae thrive on sunlight, so consider adding floating plants or a pond cover to reduce sunlight exposure.
• Regular Maintenance: Keep up with skimming, pruning aquatic plants, and removing sludge from the bottom of your pond.
  

FAQs:

• Q: What fish are best for controlling algae? A: Grass carp and koi are effective algae eaters.
• Q: Can I overstock algae-eating fish? A: Yes, too many fish can lead to more waste and higher nutrient levels, so keep your fish population balanced.

Ready to Restore Your Pond?

If you’re struggling with pond scum and need a solution tailored to your specific pond, check out our products at Midwest Ponds. From aeration systems to beneficial bacteria treatments, we have everything you need to keep your pond clean and clear year-round. Browse our Pond Care Collection and start enjoying a healthier pond today!

Need help finding the right product? Our pond care experts are here to help. Contact us at Midwest Ponds Contact Page for personalized advice and recommendations!