The Powder-Coating Process

Koenders uses a paint finishing technique called powder coating in order to ensure top quality, rust proof finish for our customers. Powder coating is a technique that applies dry paint to galvanized steel and then the paint is baked onto the surface.

Koenders deploys a 4 step process in powder coating its products


Preparation is extremely important to ensure a strong and resistant finish. Since Koenders Windmills are exterior products there is a special preparation process that consists of the follow steps to ensure the paint adheres and remains to the galvanized steel parts. CLEAN, RINSE, ETCH, RINSE, GRAIN REFINE, ZINC PHOSPHATE, RINSE, ACIDULATED RINSE.

The etch step is required to remove any zinc corrosion that forms on the galvanized steel. The grain refiner makes sure that a fine phosphate is produced.

Apply Paint

The dry powdered paint is electrostatically charged and sprayed onto each part of the windmill. The powder is applied with an electrostatic spray gun to each part. The powder is fluidized before entering the gun to improve the electrostatic charge and separate the grains of powder. This allows the powder to move more efficiently through the spray gun.

By electrostatically charging the paint particles, the powder clings to all the surface areas of each, front and back.

Bake Powder

While the electrostatic powder remains charged on the parts they are placed into a baking oven that melts the powder particles together to form a solid finishing. Koenders use thermosetting color powders that will not re-melt upon reheating to ensure that the finish remains intact in all extreme weather conditions and temperatures.

Quality Check

Our powder coating experts review each part to ensure all surface area is adequately covered. Powder coat paint produces a strong, hard, abrasion resistant finish. Koenders gives a palette of colors to choose from that can be mixed and matched to form personalized windmills.


Red  Red
Bronze  Bronze
Gold  Gold
Green  Green
White  White
Royal Blue  Royal Blue

Purchase a Powder-Coated Koenders Uni-Pole

Single Diaphragm System – Galvanized
Double Diaphragm System – Galvanized
Uni-Pole Windmill Aeration System
Jet Stream
Turbo Jet Stream


"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