When choosing a pond liner, you can consider things like your budget and the type of pond you're creating. You can also use an underlayment to protect the liner from punctures caused by sharp objects in the soil. Pond liner is a watertight material that's placed on the bottom and sides of a pond to prevent water from leaking into the soil, and are important for several reasons:
Water retention: Pond liners keep water levels consistent, so you don't have to refill the pond as often.
Soil protection: Pond liners prevent soil erosion and contamination.
Plant and fish environment: Pond liners provide a stable base for plants and a comfortable environment for fish.
Maintenance: Pond liners require minimal maintenance to keep water levels consistent.