The best type of liner for a koi pond is often reinforced polyethylene, or RPE, because of its strength, durability, and lightweight properties. RPE liners are highly resistant to punctures, UV rays, and temperature changes, making them ideal for outdoor use in a variety of climates. They are easier to install than heavier materials and can be seamed together to fit larger or custom-shaped ponds without sacrificing durability.
Unlike some other liners, RPE does not require as much thickness to offer excellent protection, which makes it more manageable during installation. While EPDM rubber liners are also popular for their flexibility and long life, they tend to be heavier and more expensive. PVC liners, though budget-friendly, are less durable and more likely to degrade over time. RPE strikes a balance between performance and ease of use, offering long-term reliability with less maintenance.
