Field tested and proven successful for over 30 years.

Single Pump Compressor
Suitable for up to 2-acre ponds and produces up to 1.5 cfm.

A proven low-maintenance, low cost, highly effective method of maintaining water quality!

Buy with confidence, knowing that Koenders Windmills time-tested design features increase reliability, performance and safety.

4 tower heights to choose from
12′, 16′, 20′ or 24′

The Koenders Single Diaphragm Windmill Aeration System includes: 12′, 16′, 20′ or 24′ Windmill, Single Diaphragm Compressor, 100′ of Airline, Airstone Diffuser and Foot Valve. Up to a 3-year warranty.

Windmill Design Features:

The Koenders Windmill can be located up to approximately 1000′ from the water source.

Windmill Specifications
Capacity Up to 1.5 CFM (cubic feet of air per min.)
Turbine Type Upwind
Rotor Diameter 65″
Swept Area 23.05 sq. ft.
Blade Design Proprietary
Transmission Direct drive
Stroke 0.5″
Overspeed Protection Automatic
Foundation 3 ground rods; 1″ diameter pipe, 4′ long
Shipping Information
Product # of pcs Description Weight (lbs.) Dimension
12′ KFA 4 1 Head 39 25″ 10-5/8″ 15.25″
61″ stance 1 Blade & Tail 59 17.5″ 6.5″ 36″
1 8′ Tower section 52 48″ 3.75″ 3-9/16″
1 8′-12′ Tower section 27.5 48″ 2-3/8″ 3-9/16″
16′ KFA 5 12′ KFA plus
79″ stance 1 12′-16′ Tower extension 31.5 48″ 2-3/8″ 3-9/16″
20′ KFA 6 16′ KFA plus
97″ stance 1 16′-20′ Tower extension 39 48″ 3.5″ 3″
24′ KFA 1 1 20′-24′ Tower section 48″ 3.75″ 4″
118″ stance


Here’s a list of colors available:

Please call for pricing on custom colors, additional colors and all custom patterns or lettering.

We are dedicated to the design, testing and perfecting of our products.

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Nature’s Pond Conditioner


"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