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Catalog: Main > Pond Liner > Firestone Liner (25 x 25 - 25 x 200) 25x65 Feet Liner 1  Product Options     Price: $1,460.13       Product Description   Firestone EPDM Liner 25x65 FREE SHIPPING 45 Mil EPDM Fish Safe Liner with a 20 Year Limited Manufacturers Warranty. This Top Grade Tear and Puncture Resistant .45 mil EPDM liner is perfect for adding a stream or for lining your waterfall. Never settle for PVC or anything less than .45 mil EPDM PondGard Liner. To figure your pond liner size: Take your measurements: Maximum width, Maximum length and Maximum depth. Now take your maximum depth and multiply this number by 2. Take this figure and add 2 for your overhang (This is counted as 1' for each side multiplied by 2). Now take your total and add to your maximum width and add the same number to your maximum length. You will most likely need to round up to match one on the pre-cut liner sizes. Here is an example: Maximum width = 5' Maximum length = 10' Maximum depth = 2.5' (2 x's 2.5' = 5' + 2 = 7) (7 + 5 = 12' width) (7 + 10 = 17' length) So you would need a liner close to 12' x 17' and the closest would be 15' x 20'. You could also back fill, re-measure and see if you can get your measurements to 10' x 15'.      Suggested Products   Seam Tape (Two Sided) 3x25 Roll Add Price: $44.99       Cover Tape (One Sided) Add Price: $79.99