If the koi pool water is turbid, it needs to be changed properly, and filtration can be strengthened at ordinary times. Water is usually changed once a week, so as not to change water frequently, so as to avoid fluctuation of water quality and stimulation of koi fish. Don't change more water every time, at most, it can't exceed one third of the total amount, usually between one fifth and one quarter. A circulating pump can be installed for filtration, and it is better to have a fish pond filter.

1. Eliminate algae: If the water body is turbid caused by algae, the best way to make the water body clear is to remove algae. If there are a large number of algae, they can be salvaged manually directly. If it is Chlorella, it needs to be eliminated with algae removers and other drugs. It should be noted that the dosage of algae remover should be controlled to avoid endangering the health of fish.

2. Proper shading: Although the water body can be made clear only by eliminating algae, the algae will still reproduce after a long time. Therefore, to avoid this situation, it is best to shade the fish pond properly, and many algae can not grow by controlling the illumination. However, shading is not completely blind to light. If light is scarce, some algae that don't like light will become dominant algae, which will also make water turbid.

3. Controlled feeding: In addition to algae, the mass reproduction of microorganisms will also make the water in the fish pond turbid, and the nutrition they need for reproduction is the fish food and feces excreted by the fish. Therefore, by controlling the feeding amount, the number of microorganisms can also be limited, thus gradually restoring the water body to clarity, which is also conducive to the maintenance of water quality.