If you could mine your Pond.....
you would find minerals and metals!
These minerals and metals are normally found in fresh water and evaporation and consequent topping off concentrates these minerals and metals more and more.
This accumulation of minerals can be harmful to the Pond Fish!
It is best to do a partial water change in the Autumn (20 - 30%) to dilute these substances and make the Pond healthier for your Fish to survive the winter.
We have talked many times of the importance of de-chlorinating all tap water that is added to the Pond, no matter how small a quantity it is. This time of year it is helpful to use a De-Chlorinator such as "Stress Coat" which helps to increase the slime coat that protects your Pond Fish from disease and parasites during the time when they are most vulnerable: Winter!
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