How to protect a pond or pond from frost?

Certain measures should be taken to preserve the pond in winter.

Temperatures are dropping: can this endanger your fish or aquatic plants? What needs to be done? Our answers.

Plants are not the only victims of cold and frost. Water bodies such as basins or ponds are also affected. Our advice for storing them for the winter.

Why is freezing dangerous for a pond?

A layer of ice on your pond can prevent proper oxygenation of the water, which is essential for fish survival. During the cold season, these often take refuge in the deepest part of the basin, which is warmer. The air they need must therefore be renewed.

Even for aquatic plants, it is important to keep the water in contact with the air. Some, too fragile, will even have to be removed from the pool.

It is therefore recommended to keep part of the water surface ice-free using a few tips. The necessary gas exchanges between air and water can thus take place.

What should I do if the surface of my pond freezes over?

If your small pond has frozen over, gently pour hot water or place a pot of boiling water on top of the ice to slowly melt the crust that has formed.

The ice must not break: in fact, the shock wave caused could kill the fish living there and also damage the pool.

Some plants are resistant, but not all. Lotus, white thallium or pontederia can survive if planted deep enough (at least 80 cm).

However, some aquatic plants do not tolerate the cold at all and will have to be wintered under shelter:

  • water hyacinths
  • water salad
  • some water lilies, especially those with blue flowers or the giant water lily

To do this, take them out of the pool before the cold weather and place them in a frost-free and bright room, such as a conservatory.

Remove the plants from the pond and pay attention to the rhizomes and roots. Place the plants in large buckets or aquariums filled with room temperature water. Remove dead parts (leaves, stems).

After the ice saints, you can return them back to your pool.

How to prevent the pool from freezing?

Before the arrival of the first frosts, certain measures should be considered.

In a small pond, place “floats” such as empty bottles or driftwood on the water. You can also commercially purchase antifreeze bells or airstones. Thus, gas exchange between water and air can occur.

Depending on the area and the budget you intend to allocate, it is also possible to install a submersible aeration pump, the flow of which can be slowed down in the frost period, but only on the condition that it is not completely submerged, or a resistance heating system or even invest in a floating polystyrene pond heater, equipped with an aeration pipe.

The flow may be slowed or slowed as the cold effect of the water leaving the filter tends to cool the pool temperature.

If a frost is forecast, you can warm the relevant surface to equilibrate to around 10°C before the expected episode.

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