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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.

Yes, natural pools can get algae since they use the same filtration processes as lakes or streams. However, you can reduce the risk of algae by adding more algae-fighting plants and not installing your natural swimming pool in direct sunlight, as it promotes algae growth.

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.

When deep cleaning your koi pond, transfer fish to a clean, uncontaminated container at least one foot deep, like a large bucket, tub, or kiddie pond. Fill the container with their existing pond water to avoid shocking them, and place the container in full or partial shade. When it’s time to reintroduce them into the pond, slowly add the new water to the container before adding the fish and container water back into the pond.