The biggest problem in stagnant water ponds is that water does not flow. As the saying goes, running water does not rot. Therefore, in order to improve water quality, some water can be released regularly and then a proper amount of new water can be injected. Be careful when discharging water. It is best to have a filter screen at the outlet to ensure that the fish inside will not escape. The water source must be selected for water injection to ensure that the water quality is clean and pollution-free.

Pond cleaning is also a good way to improve the water quality of the pond. Generally, during the idle period of the pond, that is, when no fish is raised, all the water in the pond is released, and the thickness of the silt is checked. If it is too thick, some of it should be dug out. Then a small amount of water is injected, and quicklime is sprinkled in the whole pool. Because quicklime will emit heat and generate strong alkali when it meets water, harmful bacteria can be eliminated, which is more conducive to the maintenance of water quality.

If algae are found in stagnant ponds, they must be removed in time, because algae are easy to explode, they will occupy the water body and absorb oxygen in the water at the same time, resulting in fish unable to breathe. There are many ways to remove algae, which can be salvaged manually or killed with algae remover, but the dosage must be controlled.

Some aquatic plants or other aquatic plants can be planted in the pond. These plants can absorb ammonia nitrogen in the water body and release oxygen, which can also maintain the water quality and slow down the deterioration of the water body.