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Installing an outdoor water fountain costs $2,700 on average, not including the cost of the unit. Prices range from $150 to $10,650, depending on your location, the type of fountain, size, and accessibility to the site. Self-contained fountains and water features recirculate the water within the unit. Depending on size and features like multi-tiered cascading bowls, they typically cost from $50 to $5,000. More elaborate fountains with waterfalls and ponds can cost from $450 to $10,000 or more.

In addition to length and width, pond liners also come in various thickness levels. Thickness is measured in mils, a unit of measurement equal to one-thousandth of an inch, with most pond liners ranging from 15 to 60 mils in thickness. The smaller the number, the thinner (and weaker) the liner. To prevent rips and tears, it’s best to choose a pond liner that’s at least 30 mils thick.

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.

Koi fish should be in the shade and can’t be directly exposed to the sun. Consider building your koi pond in a shaded spot or hanging an awning over the top to control the amount of sunlight coming in. Learn how to design a landscape properly.