Your cart is empty.
Your cart is empty.Product Description
Boxed & Roll Sizes in 20-mil thicknesses
- 6 ft. x 5 ft. through 6 ft. x 100 ft.
- 12 ft. x 10 ft. through 12 ft. x 100 ft.
- 18 ft. x 15 ft. through 18 ft. x 100 ft.
- 25 ft. x 15 ft. through 25 ft. x 100 ft.
- 37.5 ft. x 20 ft. through 37.5 ft. x 200 ft.
- 50 ft. x 30 ft. through 50 ft. x 200 ft.
- 62 ft. x 30 ft. through 62 ft. x 200 ft.
Pond Liner for Water Gardens, Ponds, Lakes and Retention Basins
10-Year life expectancy when exposed to direct sunlight & 40+ years of life expectancy when not exposed to direct sunlight and when covered by earth, rock or water.
Linear low-density polyethylene (LLDPE) is a substantially linear polymer (polyethylene), with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins. Linear low-density polyethylene differs structurally from conventional low-density polyethylene because of the absence of long chain branching. The linearity of LLDPE results from the different manufacturing processes of LLDPE and LDPE. In general, LLDPE is produced at lower temperatures and pressures by copolymerization of ethylene and such higher alpha-olefins as butene, hexene, or octene. The copolymerization process produces an LLDPE polymer that has a narrower molecular weight distribution than conventional LDPE and in combination with the linear structure, significantly different rheological properties.
UnderGuard Underlayment Nonwoven Geotextile
We highly recommend using an underlayment when installing any type of pond liner. We offer an underlayment that adds an extra layer of protection between pond liner and rocky or unstable soils while preventing air voids between the liner and earth reducing wear and abrasion. The biggest contributors to project failures is poor, unstable soil conditions.
UnderGuard Underlayment is perfect for stabilizing soil and creating 'rock pads' during installation. Needle punched nonwoven polypropylene geotextile fabric with a random, three-dimensional pore structure and a uniform, felt-like consistency, high tensile-strength fabric enhances soil stability and controls erosion. Virtually indestructible; unaffected by hydrocarbons & freeze-thaw cycles.
This listing does NOT include UnderGuard Underlayment Nonwoven Geotextile.
FAQs and Selecting the Correct Size
What size liner do I need?
The basic formula will work for ALL pond shapes sizing a pond liner is:
[(Pond Length') + (2 x Pond Depth') + (2') = Liner Length'] & [(Pond Width') + (2 x Pond Depth') + (2') = Liner Width']
For a finished pond that is 12' long, 7' wide, and 3' deep; then using the formula above, the liner size you need is:
[(12') + (2 x 3') + (2') = 20' Long] & [(7') + (2 x 3') + (2') = 15' Wide]
How many gallons of water is in my pond?
The formula for determining the number of gallons of water in a pond is simple.
(Pond Length') + (2 x Pond Depth') + (2') = Liner Length'
For Square and Rectangular Ponds: (Pond Length') x (Pond Width') x (Pond Depth') x 7.5 = Gallon Size
For example, if you want a finished pond that is rectangular in shape, and is 12' long, 7' wide, and 3' deep; then using the formula above, the gallon size of your pond is: (12') x (7') x (3') x 7.485 = 1,890 Gallons
For Oval Ponds:(Radius1') x (Radius2') x Pi(3.14) x (Average Depth') x (7.485) = Gallon Size
For example, if you want a finished pond that is oval in shape, and is 12' at the widest length across, 7' at the shortest length across, with a 3' average depth; then using the formula above, the gallon size of your pond is: (6') x (3.5') x (3.14) x (3') x 7.485 = 1,480 Gallons
4. How deep should I make my water feature?
For fish ponds, a depth of at least 18", or deeper is recommended. Healthy fish LOVE to move up and down, as well as side to side! For water gardens, the water feature should have a depth of at least 12", or deeper. Check your local fence requirements (building codes) and freeze line depth.
Edward S Lucas
Reviewed in the United States on April 19, 2025
Pond liner was available in exactly the size I needed and in two gauges. Opted for the thicker one. Price was good relative to other suppliers on the internet. Liner was well packaged and delivered within two days, as promised. Installation was just completed and not difficult. So, everything is great so far. Very pleased with this product.
Puppy Mom
Reviewed in the United States on September 23, 2024
Very stiff and difficult to work with to line my fish pond.
Customer
Reviewed in the United States on May 31, 2023
I bought this liner to build a creek bed I have running between two ponds. Around the bends in the creek it was a bit difficult to turn and fold (I ended up riveting parts of the edges on the inside of the bends in the creek to get it to lay flat) but it turned out pretty nice.The liner was a lot cheaper and a LOT lighter than an EDPM liner which made it well suited for this small job. I only used about 1/3 of the liner I bought (It was easy to cut too) but it was still the cheapest, reliable thing I could find. I expect I'll find some use for the other 2/3.
david miller
Reviewed in the United States on December 18, 2023
Covered the old and the new is awesome.
PLB
Reviewed in the United States on September 7, 2022
The liner is a little stiff and harder to fold than some other liners I've used. It also had a few small holes at one of the edges. Other than those slight problems it has worked well. The seller sent the wrong size initially, but they made it right without any delays. So really good service from Half Off Ponds.
Kevin Kenny
Reviewed in the United States on June 7, 2021
It was thinner than I expected but it looks like it will work fine
marvin simon
Reviewed in the United States on April 8, 2021
pond liner not quite as flexable as i wanted,,but ngood
Lou S.
Reviewed in the United States on May 19, 2020
exactly what I needed---was sick and tired of weeding a garden day after day---bought this item---20ea 20 gallon plastic tubs and organic soil for raised beds---put the liner down added the tubs and soil seeded/transplanted seedlings-------no more weeding just growing----awesome easy care and looks good too!!!!
Recommended Products