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While there’s always a possibility that pests will appear in and around a natural swimming pool—much like regular swimming pools—they largely deter pests due to their natural filtration system, which keeps things clean and the water constantly moving.

A good rule of thumb is to change 5% to 15% of your koi pon’s water every week. Partial water changes help keep your koi healthy, and replacing small amounts at a time prevents causing stress for the fish.

Every one to three months, you should perform regular fountain maintenance, including draining, cleaning, and rinsing the components of your fountain basin and the pump and tubing to prevent algae and other buildup. Fountain maintenance also includes keeping the appropriate water level and removing debris like leaves, insects, and twigs from the water to avoid clogging the pump. You can also hire a professional landscaper to clean your fountain for around $50 to $150 per month on average.

A koi pond should be at least 5 feet deep to keep the fish healthy and ensure they don’t freeze in winter. Koi fish are also known for growing large, so the more room you have, the better. A larger koi pond size will allow the fish to grow bigger than a smaller one will, and the more fish you have, the bigger the pond you’ll need. Learn how to build a pond in your backyard to ensure it remains functional and aesthetically pleasing for a long time.