Pond Scum No More – How to get rid of Algae in Ponds for Good… The Secret is Pond Aeration

Pond Algae is a sure sign of an unhealthy pond. The arrival of spring often presents a problem for pond owners as the beautiful, clear green water of their ponds disappears beneath a blanket of lime green, slimy, stinky pond algae and pond scum. “Pond Algae or Pond Scum” is a popular term for aquatic algae, which tends to “bloom,” or flourish in the Spring time, and tends to spread over the top of the pond like an unwelcome green and brown blanket of unsightly, odorous vegetation.

Aquatic algae is a classified as a plant, but unlike most plants it has no roots, stems, or leaves. Pond algae can be found either floating on the pond surface or attached to other plants, bottom sediments or other hard surfaces.

Pond algae can be narrowed down into three categories even though there are literally hundreds of types of aquatic algae; microscopic algae, filamentous algae and attached-erect algae.

Microscopic Algae

Microscopic algae, also called phytoplankton, are tiny, free-floating algae that give the pond water its characteristic green color. Microscopic algae are the primary producers of dissolved oxygen in pond water. The presence of a healthy level of microscopic algae in a pond is important for maintaining good water quality and health of the aquatic organisms in the pond, such as fish. What tends to happen with unhealthy ponds is that too much Microscopic algae exists especially during the warm days of summer. Then there is a sudden die off of this algae which depletes the dissolved oxygen levels in the water. This depletion of oxygen can kill other aquatic organisms as well as fish.

By having excess amounts of dissolved oxygen in your water source this should never occur. The Koenders Pond Aeration Systems avoid this from happening.

The clue for the pond owner to know when a Koenders Windmill Aeration System would be necessary is to look for a change in the color of the water that might signal that a bloom of microscopic algae is taking place. This color change would be from the clear greenish water of the healthy pond to a bright denser green color like soup.

Green Filamentous Algae

Pond Algae called green filamentous algae is one which gives pond owners some of the biggest challenges. There are a lot of types of green filamentous algae that can survive in both cold and warm water and can blossom in early spring.

To identify if you have these forms of algae in your pond look at the sides of the water in the more shallow areas where sunshine is predominant. It is here where the algae joins together and creates long strands resembling thin grass or hair. They grow in fur like balls along the pond bottom and edges of the pond and then as more and more of them grow they float to the surface and form dense blankets of algae.

Sudden die-offs of green filamentous algae blooms can create very poor water quality along with extremely unattractive and odorous conditions as the dead algae decays. Again with the presence of increase levels of dissolved oxygen many of these conditions can be avoided. Koenders Windmill Aeration System along with its airstone diffuser kits dissolve high levels of oxygen into your pond to avoid these situations from arising.

Attached Erect Algae

Attached-erect algae is a less common problem for pond owners, it resembles an underwater plants and grows at the pond bottoms causing an inconvenience for anglers and an unenjoyable experience for swimmers. Attached-erect algae, is sometimes called musk grass and is often mistaken for more advanced pond plants because it resembles a higher plant with leaf-like structures arranged about a long stem-like structure.

Pond Algae Control

There are many ways to control algae; You can try to ensure that excess nutrients, leaves , rain runoffs do not flow into your pond. There are types of fish that can be added to your pond that will eat the algae before it blooms. One of the most effective way remains to be dissolving additional levels of oxygen in your water.

By doing this it will burn off excess nutrients from your pond and avoid the algae bloom in the first place. Koenders Pond Aeration Systems are the leaders in the world for providing cost effective, self operation windmill aeration systems. The best part is that you do not have to pay anything for electricity to run them. They operate by the wind – environmentally friendly with the avoidance of chemical treatments. Who could ask for more? Oh, and they look good too.

To Purchase a Koenders Windmill

To purchase a Koenders windmill or accessories, you can Order Direct Online or use our Locate a Dealer form to find the dealer closest to you.


"Our pond brings a great deal of pleasure to me, thus I want to keep it algae and muck free especially in the hot summer months where pond water issues area more predominant. This year we had a very hot summer, extreme temperatures that got up into the high 80’s, low 90’s and with the use of Koender’s Nature’s Pond Conditioner and aeration windmill I was able to keep my pond algae and muck free. My goal has always been to prevent pond water issues from occurring as opposed to waiting until there is an issue."

- Christene Sandeson | Brookfield NS

We can see the bottom of our pond!!

We are using a Koenders Water Solutions 16 ft Single Diaphragm Windmill System as well as Nature’s Pond Conditioner and Dye to keep our swimming pond clean and clear and we can see the bottom at 16 ft deep.

- Patti and Peter | Poplar Forest Lodge and Campground, East Selkirk Manitoba

We are very happy with the product. We also have one of your aeration windmills and pond rakes. Before putting in the Natures’ Pond Conditioner we had a record year of Algae in our pond, all over and thick. The year after using Nature’s Pond Conditioner along with raking out the algae as well, we have had our record year of the pond being the healthiest it has been. The algae was so bad before I can begin to describe it.

- Daniel | Wisconsin

I have been on the nature’s pond care program of for about 2 years now, using the Koender’s Double Diaphragm windmill aeration system and Nature’s Pond Conditioner as well as the Nature’s Pond dye and I am very happy with the results. The algae is almost eliminated and the pond weeds have been reduced significantly, where the pond weeds once went 15-20ft from the shoreline are now only 3.5ft from the shoreline. The Koender’s Aeration windmill has impressed me on how well it has kept the ice off the pond in the cold winter months, not to mention, it’s been virtually maintenance free

- Don | Peoria IL

During the Winter, we use Koenders Dual Diaphragm Windmill for aeration with 2 airstones and Nature’s Pond Conditioner. It keeps the fish nice and healthy all seasons. We use the pond for fishing and also swimming in the Summer. We’re really happy with everything.

- Sean | Ontario