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The size pond each liner can make will depend on the depth. For example with this 8'x10' liner you can make a 1.5' deep pond that is 4'x6' or a 2' deep pond that is 3'x5' (this allows for a 6" overlap on all sides). This long-lasting pond liner is both fish and plant safe and easy to install for the pond professional or DIYer. Selecting a quality pond liner like this Fish Safe liner is key to starting with the right foundation for your project. Fish Safe liner is a great material whether creating a water garden, koi pond, disappearing water feature, or other water retention needs. When using an 8 x 10 liner you will need approximately 80 sq. ft. of underlayment. The most economical option is a 12x12 (144 sq. ft.).