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Professional-grade 45-mil EPDM membrane in a 20 by 15 foot sheet, covering 300 square feet. The largest sheet in this range. Fish-safe, for koi and fish ponds, pondless waterfalls, and fountains.
EPDM stretches, which lets the liner conform to an irregular excavation without seaming or folding badly at corners. At 45 mil it resists puncture from rock and gravel while staying flexible enough to install by hand. Thinner PVC liners cost less but become brittle with age and won't stretch into contours.
Measure length plus twice the maximum depth, and width plus twice the depth, then add roughly 2 feet in each direction for edge overlap. At 20' x 15', this covers a substantial pond or a large pondless reservoir. Smaller sheets are available at 10' x 25' (250 sq ft) and 8' x 10' (80 sq ft).
A 300 sq ft sheet of 45-mil EPDM is heavy. Plan on more than one person to position it, and unfold rather than drag it across the excavation to avoid abrasion before the water goes in.
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