Winterizing Your Large Pond

Winterizing Your Large Pond

Why You Need To Winterize Your Pond

If you live in a cold area, especially places like Wisconsin and Michigan and all places really cold in the winter, it’s time to get ready. DO remember to remove your surface aeration, as freezing water can do damage to pumps and everything else with your pond fountain or surface aerator. Even pond floats and nozzles can be damaged. Wintertime is a great time of the year to do maintenance on your system. If you own a Kasco unit, don’t forget to replace the anode!

But on top of that, if your pond is freezing over, remember the ice and snow will block the sun, preventing photosynthesis. Because of this, plants will stop producing oxygen and will die off, and your pond will start decomposing them, using even more oxygen. Thus, a potential case of very low oxygen can be dangerous for your fish. The good news is that, according to Kasco Marine, studies have found that you only need to have an open area of 1-2% of your pond’s total surface area to prevent a fish kill.

There are two main ways to deal with really cold ponds: de-icers and bottom, diffused aeration systems.


De-icers sit near the top of the pond and move the warmer water at the bottom up to the surface. This temperature change melts the ice away and keeps it from re-forming. The open space allows oxygen into your pond and a vent for harmful gases to be released. This process is called a gas exchange.

Bottom Aeration

In case you don’t already know, bottom aeration using a diffuser system pumps air from a compressor through tubing to a diffuser or series of diffusers at the bottom of pond. As the bubbles rise, they move the warmer water to the surface, thus also melting the ice.

A note of caution, though, according to Kasco Marine:

“When using a diffused aeration system in the winter, you may need to reduce the number of diffusers used to avoid “super-cooling” which can be dangerous to fish and possibly make the ice even thicker. Another tip is to move the diffuser heads closer to the shoreline in the winter. This will help prevent super-cooling since it isn’t drawing water from the deepest part of the pond or lake and it will maintain an open water area that touches the shoreline.”

We at Fountain Mountain stand firmly by Kasco’s recommendations and products. We don’t think you will find a more resilient and energy-efficient product on the market.

open area created by diffuserOpen area created by Kasco diffuser system

bubbles from diffuser  Kasco Diffuser sitting at bottom of pond


kasco de-icer

kasco De-icer photo

Kasco De-icers at a marina

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