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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.

How many fish can call your pond home depends on the volume of the pond and the fish size. Your pond's filtration system also influences the number of fish that will thrive in a pond. A general rule of thumb is to have 1 inch of fish for every square foot in a pond that's 2 feet deep. Another rule of thumb you can follow is to have one koi fish for every 200 gallons of water or two goldfish for every 200 gallons.

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.

You can choose several types of fountains to add to your backyard, ranging in size, number of basins, and special water features. 

Check out the price ranges of common fountain types:

• Birdbath fountains: $40 to $1,100

• Cascading fountains: $40 to $2,000

• Tiered fountains: $100 to $6,000

• Kugel fountains: $150 to $5,000

• Glass wall fountains: $100 to $3,000