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Last update on December 24, 2025

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Fountains questions, answered by experts

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.

Fountain maintenance is an important part of having a clean foundation in the first place. To keep your fountain water clean, you can use a water additive designed specifically to limit scale, algae, and other buildup in fountains. Or opt to use white vinegar as a pantry-ready water additive.

If you’re drinking the water, you can store it indefinitely as long as you properly treat it and your container doesn’t break down. Without any treatment system, you should only leave rainwater in a rain barrel for up to four weeks. If you’re using the water on your garden or lawn, you can store your water until algae start to grow. 

One reason you may want to fill in your pond is the cost of maintenance. Pond cleaning may cost about $1,000 for an annual cleanup, or monthly visits may cost $75 to $100 per visit. If you don’t want to spend that much per year on pond upkeep, you may consider filling in your pond.

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.

The Killdeer, ND homeowners’ guide to fountain services

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