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Though there are a lot of factors that go into caring for a koi pond, the most important maintenance you can do is frequent water checks using a koi pond test strip that checks the water for dangerous conditions.  In addition to regular pond maintenance costs, you’ll also need to winterize your koi pond if you live in a colder area.

Pond water should be changed approximately once a week. When you change it, change around 10% to15% of the water. It’s important to monitor the quality of your pond water as this will determine if it needs to be changed more often, or if you should be changing more or less than 15% of it when you do so.

To maintain your pond, you’ll need to occasionally clean your backyard pond, especially if you have koi fish. Test the water twice a week to make sure your fish have everything they need and always remove visible debris.

Installation costs range from $1,500 to $10,000, depending on pond size, materials, and additional features like waterfalls or fish habitats.