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Lifespans vary by material and manufacturer, but pond liners last anywhere from 10 to 75 years. For example, polyvinyl chloride (PVC) pond liners have a life expectancy of up to 20 years. Other types of pond liners, including those made of high-density polyethylene (HDPE) and ethylene propylene diene monomer (EPDM), can last 40 to 50 years.

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.

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.

Placing your water feature in direct sun can speed up evaporation, leading to pump damage and algae growth. Shade or partial shade serves as the ideal location for most water features—just watch out for tree and plant debris that may fall in and clog the pump.