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Professional-grade 45-mil EPDM membrane in an 8 by 10 foot sheet, covering 80 square feet. Fish-safe, for koi and fish ponds, pondless waterfalls, and other water features.
EPDM stretches, which is what lets a 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 crack with age and don't tolerate being stretched into contours.
Measure length plus twice the depth, and width plus twice the depth, then add roughly 2 feet in each direction for overlap at the edges. An 8 by 10 sheet is suited to a small pond or a pondless reservoir. Larger sheets are available at 10' x 25' (250 sq ft) and 20' x 15' (300 sq ft).
Resistant to solar UV, ozone, and oxidation, and backed by a 20-year guarantee, which is the relevant figure for a component buried under rock that you cannot practically replace.
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