The lifespan of a pond liner in a koi pond depends on the material used, the quality of installation, and exposure to environmental factors. High-quality RPE liners can last 20 to 40 years or more due to their strength, resistance to UV damage, and durability against punctures. EPDM rubber liners, which are also widely used, typically last 20 to 30 years with proper care. PVC liners tend to have a shorter lifespan, often around 10 to 15 years, as they are more vulnerable to cracking and degradation over time, especially when exposed to sunlight.
Regardless of the material, using an underlayment beneath the liner helps prevent damage from sharp objects in the soil. Keeping the liner covered with rocks or plants around the edges also protects it from UV exposure and physical wear. Regular maintenance, such as checking for leaks and keeping debris from accumulating, supports a longer lifespan.
