What to do when it starts to freeze??

Here in Holland you normally don’t know when it starts to freeze. You never know exactly. For example the skating marathon in Friesland. Sometimes it is held 2 years in a row, then 15 years pass before it can be held again. I took precautions and put a heating system in the water. A piece of about 40cm is defrosted, but not the whole tank. Putting the tank inside isn’t an option either, because there isn’t a room where the temperature is above zero. Now I have an ‘aeration pump for dry installation’ because we’ve also got a pond.

This only works when it doesn't freeze hard.(about 2 degrees under zero) Because the water is in movement all the time, because of the air, it doesn't frost up.

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