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What is supercooling? | Ponds & Lakes Q&A

Q: What is supercooling??

Q: What is supercooling?

Aloma, Warroad, MN

A: Supercooling is uncommon, but it can occur in lakes and ponds, particularly in the northern states. Here’s what you need to know about it and how to prevent it from happening.

In the winter time water stratifies in pond and lakes without proper aeration when surface temperatures are extremely cold, creating what’s called a thermocline. A thermocline happens as warmer water about 39°F or so – sinks to the bottom, while colder water about 32°F or so – rises to the top. Very little mixing of the layers occurs, particularly in calm weather.

Supercooling could become an issue if you’re running a surface aeration system in shallow ponds with fish. The fish prefer to stay on the bottom of the pond in the warmer pockets of water during the winter. They’re in winter-hibernation mode, and all they want to do is be in a stress-free spot until spring.

As the aerator circulates the warmer water with the cooler water at the surface, the overall temperature could drop. In extreme cases when the temperatures are well below 0°F, the water temperature can actually drop below its freezing point without becoming a solid – a rare process known as supercooling.

If the water gets too cold, your fish have nowhere warm to go. Living without their warm hangout spot could compromise their oxygen supply and immune systems, making them vulnerable to parasites and diseases.

The best way to deliver oxygen to your fish is with a bottom diffused aerator, like an Airmax® Aeration System. You can keep it running without creating an inhospitable environment for your finned friends by simply moving your diffuser plates closer to the surface or turning half of them off.

If you relocate the diffuser plates to a spot that’s about half the depth of your pond or run only 50 percent of them, a pocket of warm water will remain for your fish at the bottom. You’ll continue pumping oxygen into the water and keeping a hole in the ice for gas exchange without having to worry about freezing your fish.

Pond Talk: What steps do you take to prevent over cooling or supercooling your pond?

Call (866) POND-HELP - Free Aerial Aeration Mapping Service

Didn’t Get What You Wanted This Christmas?

Our Gift To You?

Didn’t Get What You Wanted This Christmas?

Whether Santa left you hanging this year or you’re eager to put your newly acquired gift cards to good use, it’s not too late to give your pond some holiday cheer. As a thank you for another amazing year, we’ve extended our $30 off $150 promotion through January 2nd. We hope you are enjoying the holidays and wish you the best for the New Year.

-Sincerely
The Pond Guy® Staff

When should I remove the fountain from my pond? | Ponds & Lakes Q&A

When should I remove the fountain from my pond?

When should I remove the fountain from my pond?
Fran – Lapeer, MI

While we’re not particularly anxious for winter to arrive it is in our best interest to start preparing for the cold that will inevitably come. Since you are working not only outdoors but in the water as well you may want to get a jump start on removing your fountain from your pond before you start feeling the full effects of winter.

Convenience aside, you can leave your fountain in the pond until ice starts to form. Surface forming ice may damage the float or other parts of your fountain and can potentially prevent water passing through the spray nozzle from returning back into the pond. This ice barrier can cause the fountain to run dry destroying your fountain’s motor.

Removing your fountain and preparing it for storage is a fairly simple process. Most fountains have a quick disconnect at the motor that lets you separate the fountain from the main power cord. Make sure you turn off the power to the fountain and pull your fountain ashore. Wash down the fountain and float assembly to remove any algae or debris that may have accumulated over the season, a pressure washer makes short work of even the dirtiest fountains. Inspect electrical cables for signs of wear or damage and, if your fountain has lights, check for burnt out or damaged bulbs and lenses.

Since the fountain is out of the pond and won’t be used for a few months, now is the perfect time to send it to a licensed repair facility for any routine maintenance it my require such as oil changes or seal replacements. Once your fountain is cleaned and inspected store it in an upright position in a climate controlled location like a heated pole barn or garage. Since there are many different types of fountains, it is very important that you read through your user’s manual for special instructions and maintenance plans to keep your fountain running at its very best.

If you are feeling adventurous and want to run your fountain throughout the winter you can minimize the risk of damaging your equipment by selecting a more suitable spray nozzle and regularly monitoring the environment. Choose a spray nozzle that throws heavier streams of water instead of a misty pattern. Water moving at a higher volume in a dense pattern is less likely to freeze than water sprayed in a finer pattern. Periodically check the fountain to make sure the spray nozzle is unobstructed and that the water can return back into the pond. If you are going to run your fountain in temperatures below freezing you will have to run it continuously or the water in the fountain head will freeze when switched off. Keep in mind that parts damaged by winter operation may not be covered under your manufacturer’s warranty.

If your fountain is your primary source of aeration you have a few alternatives to get you through the winter. Try to keep a hole open through the surface ice in your pond. This will allow toxic gasses formed by decomposing organic debris to exit the pond and let fresh air in. Since cold water holds oxygen easier and your fish are less active in cold water you may not need additional aeration. If you are concerned however, you can install a bottom diffused aeration system which can be run year round even when ice forms on the pond.

Pond Talk: Do you run your fountain in the winter? Send us some pictures of your fountain in action.

Kasco 1/2 HP Surface Aerators

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