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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.

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.

Even if you empty your pond before the winter, there’s a good chance it will refill naturally. It’s ideal in most cases, then, to leave water in your pond and winterize it instead. This method will prevent ice damage and protect wildlife. Plus, it’ll lessen the steps required to reopen your pond in the spring.

You have several options for your pond by getting your yard ready for the winter. You can winterize your koi pond by ensuring it’s at least 5 feet deep so it doesn’t freeze completely, installing a pond heater or aerator and having it run at all times, and installing a deicer if temperatures are dangerously low for an extended period. You can also choose to shut down your pond for the winter by removing all the wildlife in it and bringing it indoors, cleaning out the filter and pump, and then covering the pond with a tarp.