Koenders Windmills invented the aeration windmill in 1988. Since then, the company has supplied and served over 100,000 customers with windmills and electric aerators. Most of the Generation 1 and 2 windmills sold during the first few years are still in service. That is over 30 years of standing up to Mother Nature through both high and low temperature extremes, snow storms, dust storms…every imaginable form of severe weather.
With our history and experience, we are now producing 6th Generation models of Koenders Windmills and Unipoles, so today’s customers can be assured they are purchasing the most durable and efficient windmill and electric aeration systems available on the market.
If you require maintenance or replacement parts
BEWARE of inferior, imitation Koenders parts and products and companies that are promoting them. Over the years we have had numerous complaints from customers about product parts that have been purchased from companies whom they thought were authorized to sell Koenders products and whom they were led to believe were buying Original Koenders products and parts. These parts will not fit, or they will break prematurely. This will also void product warranty. Most of these online retailers are NOT AUTHORIZED KOENDERS DEALERS.
Why are GENUINE KOENDERS WINDMILLS and Electric Aeration parts superior to imitation parts?

  1. All Koenders Windmills parts (tower, tail and fan assembly) are hot dipped and coated with the highest quality galvanized finish. Others use a lower quality galvanizing process. The Koenders approach ensures that these product components do not prematurely rust or break. They are built to last decades.
  2. Koenders Windmills tower, tail and fan assembly parts are made from 18 gauge high quality steel which is die-form stamped for strength and consistency. Many of the parts used in higher stress areas are even a heavier 12 gauge.
  3. Koenders Windmills owns the rights to all our state of the art dies used in forming Koenders parts. These dies are extremely expensive. This attention to detail allows us to produce precision parts consistently, while maintaining proper fit and durability throughout the manufacturing process.
  4. Koenders Windmills and EL-2 electric aerators use a diaphragm style compressor. These diaphragms require periodic replacement. A genuine Koenders diaphragm repair kit is U.S. made from a high quality Garlock, reinforced rubber blend material. This Garlock diaphragm material is the best material available and maintains proper strength and stiffness even during extreme heat or cold conditions. Many customers report a 8-10 year diaphragm lifespan from a genuine Koenders diaphragm.
  5. Inside every Koenders Windmill and EL-2 electric aerator are several small valves. These valves are the diameter of a penny. Although they are small, these check valves have a very important role. If these valves do not operate correctly, the compressor simply will not work. Koenders has upgraded the original valve and replaced the rubber insert with (1.5 mm double skinned nitrile butadiene with cotton weave) which is much stronger and longer lasting. Rubber tends to crack in heat, cold and moisture and nitrile is one of the strongest rubbers available on the market so longevity is increased substantially.

To avoid issues – Order directly from Koenders Windmills, Koenders Waters Solutions or one of our Authorized Dealers.
How do you know they are Authorized Koenders Dealer?
Dealers will indicate prominently on their websites that they are authorized Dealers. If they do not, then they are not an authorized dealer and are not selling Original Koenders Windmills and Koenders Water Solutions parts.
For Sales, Support or Customer Service please call toll free 1-877-888-7707 or find a dealer closest to you by fill out our locate a dealer request form.


"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