Half Off Ponds 20-Mil LLDPE Pond Liner
20-Mil LLDPE is an economical, extremely durable pond liner with high tear and puncture resistance, and high impact and tensile strength, yet is pliable and flexible, conforming to a variety of irregular surfaces.
Half Off Ponds LLDPE is an excellent choice for residential project like water gardens, fish ponds and backyard waterfalls with gently sloping sides and smooth contours. Half Off Ponds LLDPE also meets the demands of landscape contractors and water feature installers working large commercial and municipal projects like business campus retention ponds, public works water features and residential beautification installations.
Half Off Ponds LLDPE attaches easily to waterfalls and skimmers. It works best in sweeping corners and bottom transitions. LLDPE does not easily conform to tight corner radiuses or sharp bottom-to-side angles.
Half Off Ponds LLDPE is completely fish, wildlife and aquatic plant safe. It resists stress cracking and is backed by a 10-Year Manufacturer's Warranty, even if it's exposed to direct UV radiation. In non-exposed installations, where the liner is covered by earth, rock or water and shielded from direct UV radiation, Half Off Ponds LLDPE has a life expectancy of 40 years or longer; and that's a very long time!
Economical liner with excellent durability, high tensile and impact strength, and puncture resistance.
Pliable and flexible; conforms to a variety of irregular surfaces. Excellent choice for projects like retention ponds, above and below ground water containment, and for water gardens, fish ponds and backyard waterfalls with gently sloping sides and smooth contours.
Attaches easily to waterfalls and skimmers. Works best in sweeping corners and bottom transitions; does not form-fit to tight corners or sharp angles.
Resists stress cracking and UV deterioration. Completely safe for fish, wildlife and plants.
Standard 10-Year Manufacturer's Warranty when exposed to direct UV radiation; 40+ years of life expectancy when not exposed to direct UV radiation and when covered by earth, rock or water.
Anjon Manufacturing's UnderGuard Underlayment
Features and Technical Specs
- High tensile-strength nonwoven polypropylene fabric is easy to use.
- Enhances soil stability and controls erosion while providing a stable and lasting foundation for water features, retaining walls, trenches, and planting projects.
- Needle punched nonwoven polypropylene geotextile fabric with a random, three-dimensional pore structure and a uniform, felt-like consistency. Superior drainage characteristics versus woven geotextile fabric.
- Virtually indestructible; unaffected by hydrocarbons, mildew, rot, & freeze-thaw cycles while diffusing gas and fluid build up
- Made in the USA & backed by a 20-Year Limited Manufacturers Warranty! Made from UV and chemical resistant 100% virgin polypropylene & is 100% recyclable
This listing DOES NOT include UnderGuard Underlayment Nonwoven Geotextile!
Frequently Asked Questions
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.
The formula for sizing a pond liner is:
(Pond Length') + (2 x Pond Depth') + (2') = Liner Length'
(Pond Width') + (2 x Pond Depth') + (2') = Liner Width'
So... if you want 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
This basic formula will work for ALL pond shapes.
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 accross, 7' at the shortist length accross, 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
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.
25' x 35' 20-Mil LLDPE Pond Liner
- Economical liner with excellent durability, high tensile and impact strength, and puncture resistance.
- Pliable and flexible; conforms to a variety of irregular surfaces. Excellent choice for projects like retention ponds, above and below ground water containment, and for water gardens, fish ponds and backyard waterfalls with gently sloping sides and smooth contours.
- Attaches easily to waterfalls and skimmers. Works best in sweeping corners and bottom transitions; does not form-fit to tight corners or sharp angles.
- Resists stress cracking damage from sunlight. Fish and wildlife safe.
- Standard 10-Year Manufacturer's Warranty when exposed to direct sunlight; 40+ years of life expectancy when not exposed to direct sunlight and when covered by earth, rock or water.
FAQs & Calculations to Help Select the Correct Kit
Rectangular Ponds
Example: A rectangular pond 15’ long, 10’ wide and 1.5’ Deep Pond is...
15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons
Oval Ponds
Example: An oval pond 15’ long, 10’ wide and 1.5’ deep is...
15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons
Round Ponds
Example: 15’ long, 10’ wide and 1.5’ Deep Pond
15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons
Streams
Example: 15’ long, 10’ wide and 1.5’ Deep Pond
15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons
Water Garden, Few Small Goldfish
Example: 2,000 GPH pump for a 3000-gallon pond with 2’ waterfall.
Fish Pond, Several Small Fish
Example: 3,800 GPH pump for a 3000-gallon pond with 2’ waterfall.
Koi Pond, Several Large Fish
Example: 2,000 GPH pump for a 3000-gallon pond with 2’ waterfall.
Calculating Head Height
Example: 3' (vertical height) + 2.5 (25' of tubing) + 2' (for 2 elbows) = 7.5' of Dynamic Head Pressure
Note:It is important to take into consideration while calculating how much flow will be at the top of your waterfall by accounting for the head height due to the laws of fluid dynamics. Please refer to the flow chart above to help choose the correct pump.
| Tubing Size | Efficiency GPH | Minimum GPH | Maximum GPH |
|---|---|---|---|
0.5” |
< 300 |
60 |
420 |
0.75” |
< 720 |
300 |
900 |
1” |
< 1,200 |
700 |
1,500 |
1.25” |
< 1,600 |
900 |
3,200 |
1.5” |
< 2,600 |
2,000 |
4,400 |
2” |
< 4,800 |
3,000 |
6,800 |
3” |
< 9,000 |
6,000 |
14,000 |
4” |
< 21,000 |
14,000 |
28,000 |
6” |
< 42,000 |
33,000 |
60,000 |
About Half Off Ponds
Thanks for your business! We appreciate it!
- The Half Off Ponds Team
