After the well water is fished out, first put it in a sunny place for exposure for a period of time. The well water itself is underground, can't receive light, and the temperature is naturally low. It can be properly heated by exposure, so that its temperature is consistent with the ambient temperature, so that the water temperature is suitable for the survival of fish. In addition, exposure can also remove some impurities inside and make the water body clearer.

Well water has high hardness and contains a lot of metal ions such as calcium ions and magnesium ions, which is unfavorable to the health of fish, so filtration must be used to improve water quality. Usually, soft water resin and other substances with strong adsorption force can be used, and ions can be absorbed away when they are put into water, thus reducing the hardness of water body. It can also be filtered in other ways. After filtration, check the water condition to see if it needs to be filtered again.

The oxygen content of well water is low, so it is impossible to use it directly for fish farming, so it must be oxygenated. Oxygenation requires an oxygen pump, which leads the outlet pipe to the water and turns it on continuously for several hours, so as to improve the dissolved oxygen of well water. If you still feel uneasy, you can keep oxygenation all the time when raising fish, so as to avoid the fish floating or lying on the tank due to lack of oxygen. In addition to machine oxygenation, drugs can also be used to improve oxygen in water bodies, and oxygenators are common.