How does your Windmill Aeration system work?

The Koenders Free Air Windmill has a top mounted compressor driven by wind which pushes air through the airline to the bottom of your pond.

I have a dirty pond but it is in a location where there is virtually no wind. Do you have a product that would aerate this pond?

You can use our Windmill with up to 1000′ of airline, or you can use our Electric Aerator with up to 1000′ of airline, provided you have access to electricity in the area you wish to place the Electric Aerator.

How much maintenance is required for your Aeration systems?

You should inspect your equipment once a year, as part of your routine maintenance.
Depending upon the environment in your area, you may need to replace the diaphragm and/or insert valves every 2 – 5 years, although we do have customers who are using original equipment still, after 15 years of use.

How long will my Windmill or Electric Aerator last?

You can expect your Koenders Windmill or Electric Aerator to give you 10 – 15 years of faithful service. We have customers who are still using their original equipment purchased in 1988.

Is there a Warranty Program available?

Absolutely. Once you have completed your purchase, complete our Warranty Program registration form to let us know about your product. This applies to products you are purchasing from us or from an Authorized Dealer.

How do I find an Authorized Dealer in my area?

Simply go to our Locate a Dealer page and complete the online request form. You will have a response within a very short time.

I would like to become a Dealer of your products. How do I do that?

Simply go to our Become a Dealer page and complete the online request form. You will have a response within a very short time.

I presently own a 16 foot KFA and think I would like it higher. Is it possible to do this without having to buy an entire new unit?

Yes. We have extension packages available. Contact a Dealer near you or be in touch with us.

Is there some way I can get my airline not to float?

You can either tie it down using weights or purchase Koenders Weighted Airline.

How long will my Airstone Diffuser last?

You can expect your Airstone Diffuser to last a lifetime, under normal use. It may require a cleaning every two years or so, depending upon your water conditions.

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Have a Question?

Ask our Technical Support Team.

Need an Instruction manual?

Request our complete Instruction Manual (PDF format).

Ready to Purchase?

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