Pond liners in koi ponds are typically made from flexible, waterproof materials that create a sealed barrier to hold water. The most common types are EPDM rubber, PVC, and RPE. EPDM, or ethylene propylene diene monomer, is a synthetic rubber that is very flexible and resistant to UV rays and weathering, making it popular for custom-shaped ponds. PVC, or polyvinyl chloride, is less expensive but tends to be thinner and more prone to damage, especially in extreme temperatures.
RPE, or reinforced polyethylene, is a strong, lightweight material that resists punctures and stretching while offering excellent durability and longevity. RPE liners are often preferred for their strength and ease of handling, especially in larger or more complex pond installations. Each material has its own advantages depending on the pond’s design, size, and budget.
