When autumn has moved into the country and you can almost feel the winter, you should slowly make the garden pond winterproof.
Leaves promote algae growth
It is best to make your garden pond winter-proof when the trees have dropped their leaves, because leaves and plant residues in the water promote algae growth - even at this time of year. The water itself remains. If the water depth is large enough, the fish can stay in the pond. In winter, the fish retreat to deeper regions and then fall into a kind of winter rigidity. Your metabolism then almost comes to a standstill. You therefore need very little oxygen during this time. They also do not eat any food during the winter stiffness.
Use ice-free holder
Also, you don't have to worry about your densely planted banks. The plants always keep a small air hole around them. Alternatively, you would otherwise have to work with an ice-free holder. Before the winter you should carefully silt the bottom of the pond again. You should definitely take all pumps and filters out of the water and let them overwinter in the warm. These usually cannot withstand extreme cold temperatures. And it would be really annoying if they were freezing to death. If you take these tips to heart and keep the pond in good condition, you will firstly enjoy it and secondly you will have less work with it in spring.