Cleaning and Maintenance of Koi Fish Ponds

Gardenerdy Staff Nov 5, 2018
A koi pond gets dirty easily as koi fish can produce a good amount of wastes. If you follow a regular cleaning, maintenance schedule, then the need for a complete cleaning can be reduced. Find out some tips on cleaning a koi fish pond.
Clean water, free from toxic substances and waste, is an essential requirement for maintaining the health of koi fish.
A koi fish pond can be cleaned in two steps - one is the regular maintenance and cleaning, and the other is the complete seasonal cleaning that can be done once in a year. For a complete cleaning, you have to remove the fish, and then drain and refill the entire pond.

Koi Pond Care

Regular cleaning and maintenance helps to have the amount of organic waste in check. Ensure that the number of fish does not exceed the pond capacity as overcrowding makes the pond dirty, disrupting its balance.
Do not overfeed the fish as extra food deposits at the bottom of the pond and decays and decomposes later, producing toxic substances. Remove the excess food daily from your pond with a mesh net which can also be used for removing floating debris, like leaves and other plant parts.
Install a mechanical filter to remove any kind of waste, including algae and insects from the pond. Biological filters can help convert the toxic substances to harmless substances by using a filter media that contains anaerobic bacteria.
Proper aeration of pond water is also important, which can be done by installing water falls or fountains, and a pump filtration system. A bottom drain can also be installed to remove the substances deposited at the bottom of the pond.
The growth of a small amount of algae in the pond is not harmful, as it can provide oxygen. However, an excessive growth of algae can create problems. A slight increase in acidity can promote the growth of bacteria and algae. Therefore, monitor the pH level of the pond water at regular intervals.
Barley straw extract is an environmental-friendly option to control algal growth in a pond. Baking soda and salt can be used for adjusting the pH and nitrate level of water. Observe the fish occasionally to look for any abnormality like spots or discoloration. Be sure to keep in mind that chlorinated water is very harmful for fish.
For regular cleaning, use a fine mesh net and install cleaning equipment like mechanical or biological filtration systems and a bottom drain. Despite all these, the pond may become dirty and muddy over a period of time. Koi fish are those which produce the maximum body waste.
Cleaning a muddy pond can be a bit time-consuming. A koi pond requires a complete cleaning annually, which involves the complete drainage and refilling of the pond.
A koi fish pond can be cleaned annually in spring. For this, remove the fish from the pond, and place them in a tank located in a cool and shaded area. Place an aerator at the bottom of the tank so that the fish can breathe easily. Now, drain the water and pull the pumps apart.
Clean and inspect all the internal parts of the pond carefully, especially the tubes and the pipes.
If you find any crack, then repair it immediately. If the damage is not repairable, then replacement would be the best option. The pond can be cleaned using a pressure washer attached to a low to medium pressure nozzle.
After cleaning the pond, place the internal parts in their proper places, and add a dechlorinator in the recommended amount. Now, refill the pond with clean water, and put the fish back.
Koi fish are very sensitive to slight changes in the pH, temperature, and chemical balance of the pond water.
Accumulation of waste and decayed food particles can have a severe impact on their health. Koi fish ponds should be clean, and the water should be clear. Otherwise, the fish can contract many diseases.