Best Koi Pond Liners in 2026

45-Mil EPDM Rubber Pond liner with UnderGuard Underlayment has a Limited Lifetime Warranty

Durable, puncture resistant, extremely versatile for use in waterfall features, pond kits, water gardens, retention basins, koi ponds, aquaponics, lakes, stream liners, and fish hatcheries.

Does not contain plasticizers, which become brittle and cause cracks or splits.

This item is a flat sheet pond liner measuring 4 Feet Wide x 6 Feet Long (1.22 m x 1.83 m) in 20-mil Black (0.50mm) PVC

Example pond size for this liner: 3' Wide x 5' Long x 0.5' Deep with 0' Overlap

20-mil Black (0.50mm) PVC liner material is very flexible and easily conforms to shapes and contours and is both Fish and Plant Friendly!

This item is a flat sheet pond liner measuring 8.5 Feet Wide x 15 Feet Long (2.59 m x 4.57 m) in 20-mil Black (0.50mm) PVC

Example pond size for this liner: 4.5' Wide x 11' Long x 1.5' Deep with 0.5' Overlap

20-mil Black (0.50mm) PVC liner material is very flexible and easily conforms to shapes and contours and is both Fish and Plant Friendly!

Ideal membrane for retaining water in Koi and fish ponds, Pondless Waterfalls, and other water features

Aquascape liner leads the industry in quality and reliability, making it the ideal choice for discriminating pond owners and professionals

Backed by an industry-leading 20-year guarantee, the 45 mil thickness provides superior durability while maintaining the ability to stretch for ease of installation

10 x 13ft LDPE Pond Liner ,20 Mil Pond Skins for Fish Ponds,Water Features,Fountains,Waterfall and Water Gardens,Black

20 Mil Thickness: Our pond liner is made of durable LDPE, with a thickness of 20 Mil, sun-proof and waterproof, and can be used in outdoor ponds for a long time.

10x13ft Pond Liner:It is best choice for water gardens, fish ponds and backyard waterfalls.Works better in sweeping corners, gentle sloping sides and bottom transitions.

HIGHLY DURABLE - With the thickness of 20mil, our pond liners provide superior durability than other liners, UV and ozone resistant, puncture resistant, can be used more than 30 years

FISH & PLANTS SAFE - Specially designed for water gardens, the 7' x 10' small pond liner is made of premium smooth LDPE, which is environmentally friendly, more safer for your fish and plant life than the PVC liners

MULTIFUNCTIONAL - The fish pond liners are perfect for streams, water gardens, fish/koi ponds, fountains, backyard waterfalls and outdoor decorative ponds; Also a protective waterproof liner for your different purposes

SIZE - 7 x 10 Feet Pond Liner is ideal for small ponds, up to 200 gallons of water; Easy installation, no tools required

THICKNESS - 20 Mil pond liner, thicker than the most fish pond liner in the market; Ultra-durable yet lightweight, easy to install, while flexible for a variety of creative designs

SAFE MATERIAL - Made of good quality LDPE, our liner is UV and puncture resistant, can be used for many years; Environmentally friendly, safe for your fish and plant

SAFETY -- This pond liner measuring 13' x 20', is made of LLDPE material which is safe for your fish and plant life. The auxiliary materials dissolved in the production meet the safety level of food packaging.

TEXTURED SURFACE -- This pond liner has a textured surface which can promote the growth of living creature, providing the right foundation of your pond for an environmentally balanced habitat.

FLEXIBLE -- The good flexibility makes it easy to fold and bend to your contour / outline of pond's rocks and waterfalls. Finished pond length, width, and depth can be tailored to conform to a variety of irregular surfaces and specific size.

3 Cans: Seal gaps and fill voids between streambed & waterfall rocks and stones

Stabilizes rockwork in Koi ponds, water gardens and pondless waterfalls

Moving water travels over (not under!) rocks and stones for dramatic visual effect

THICKER - 20 Mil thickened, THICKER than the most pond liner in the market; Ultra-durable yet lightweight, easy to install, while flexible for a variety of creative designs

SAFE MATERIAL - Made of good quality LDPE, our liner is UV and puncture resistant, can be used for MORE THAN 10 years; Environmentally friendly, safe for your fish and plant

SIZE - Pond Liner 4 x 7 FT is especially designed for small ponds, also you can cut to any size you need; Easy to install, no tools required

【PROTECT YOUR POND】- This liner will help to contain your pond, while also creating a safe and healthy environment for wildlife and plants. Help take care of your water features, pond pumps, filters, and more with the liner in place.

【SAFE MATERIAL】- Made of good quality HDPE, our liner is UV and puncture resistant, can be used for many years; Environmentally friendly, safe for your fish and plant.

【PLIABLE AND FLEXIBLE】- Conforms to a variety of irregular surfaces. Excellent choice for water gardens, fish ponds and backyard waterfalls. This light weight liner is easy to install.

🌟PREMIUM & UNIQUE MATERIAL: Differ from other products on the market, our pond liner is made of 100% virgin HDPE with UV treated, three layers, middle woven HDPE with two side lamination LDPE. These fish & plant safe liners are considered one of the most durable pond liners available, lasting up to 10 years.

🌟EXCELLENT PUNCTURE RESISTANCE: Other pond equipment often leaks too much and lots of water, valuable minerals, and salts are lost. However, our RPE woven impermeable membrane materials are not. It is designed for economical, safe containment of contaminated soils, liquids, or sludges. Ideal for storage or remediation/treatment of contaminated materials, chemicals & water.

🌟PERFECT SIZE: Our fish koi pond liner is 20 x 30FT dimension, big enough to enable you to cut off any shape that you need. With a thickness of 24mil, this black tarp can be left in the sun full time with no covering, 3 times stronger than normal HPDE liners.

💪[Safe LLDPE Material 15X20 FT]: The LLDPE material is used for pond liners or blended into other films to give them more flexibility and extra strength; Environmentally friendly, safe for your fish and plant. We provide small to large three different sizes for different demands.

💪[Long Last & Durability]: This material is widely used for films that need a tremendous amount of strength to absorb impacts while not tearing or puncturing. Features with well UV resistant, which can hold up to the harsh rays of the sun, and also the tear and puncture resistant, chemical resistant.

💪[Flexible & Easy Installation]: The fish pond liner that weighs 30% less than ordinary 20 mil PVC but is just as strong and flexible. Freely Bending or folding, the liner can be stretched around corners to fit nearly any pond design. Also you can cut to any size you want for your small pond; Easy to install, no tools required.

LLDPE Material: The pond liner is made of LLDPE material, pro-environmentally, sunlight-proof, weather-proof. It can restrain the penetration of harmful substances into the pond and give your fish and plants a secure living environment.

20 Mil Thickness: This small pond liner is strong enough to withstand extreme weather conditions, more durable, tear-proof, and puncture-proof. In addition, good waterproof performance can effectively retain the water in your pond.

Flexible & Pliable: The fish pond liner has good flexibility, easy to bend and fold. You can cut it in various shapes to fit all irregular surfaces(e.g., waterfalls). For better flexibility, you are recommended to lay the liner under the sun for 10 to 15 min before use.

POND LINER SKIN - Our durable pond liner has a size of 15'x 25' and a thickness of 20 Mil. It is easy to install, requires no tools and is flexibly suitable for various creative designs.

STABLE AND SAFE MATERIALS - High pressure polyethylene (LDPE) is durable material which is odorless, non-toxic. It has good softness, extensibility and good chemical stability. All the characteristics mentioned above ensure the safety of the fish pond liner, which will not cause pollution to water, air, land, etc., and ensure the safety of animals and plants

WIDE APPLICATIONS - Streams fountains, water features, fish ponds, waterfall and water gardens and more. Campus, park, garden, residential garden, community greening, square waterscape, building interior landscape and so on. Basically, you can use it for any water landscape you want to do. You'll be surprised at its performance.

Seals Leaks in Ponds, pools, spa's or filter boxes

Pressurized to get into tight spaces

Black Color 2.53 Fl Oz or 75 ML

40 Mils HDPE Rubber Liners: The pond liner is made of HDPE material, provides superior durability & flexibilitiy while maintaining the ability to stretch,can restrain the penetration of harmful substances into the pond and give your fish and plants a secure living environment.

40 mil thickness - This Pond HDPE Skins is strong enough to withstand extreme weather conditions, more durable, tear-proof, and puncture-proof and UV radiation

Good Performance - Our fish pond liner is 13x16FT dimension, has good flexibility, easy to bend and fold to fit the contours of pond rocks & walls. In addition, good waterproof performance can effectively retain the water in your pond.

Pond Liner made from HDPE material provides superior durability while maintaining the ability to stretch

Protect your pond: this liner will help to contain your pond, while also creating a safe and healthy environment for wildlife and plants.

Size: This 6.5x9.8 Precut piece is easy to place for any small pond. This liner is 20 mm thick.

FLEXIBLE & PLIABLE - Upgraded 14.5 mil LDPE pond liner provides good flexibility while maintaining the ability to stretch, which is more user friendly. Highly flexible - easy to bend down into corners and tricky shapes

UV & PUNCTURE RESISTANT - Made of high quality LDPE, UWIOFF pond liners are laminated with a UV resistant coating, lightweight yet ultra-durable, can be exposed to sun, rocks, puncture for ensuring many years of continued use

WIDE USE - 4x7ft small pond liner is perfect for fish ponds, waterfalls, backyard ponds, fountains, and other water features; Environmentally friendly, safe for your fish and plant

【Sturdy and firm】: Tough, can withstand a certain degree of stretching, 14.5 mil thickness, not easy to be punctured.

【Applicable scenes】: This PE pond liner can be used for courtyard waterfalls, outdoor fish ponds, garden fountains, and other landscape ponds.

【Size】: 13' x 20' for medium-sized ponds, can be easily divided into the size you want. The 10'x12' pond liner is suitable for small to medium sized ponds, and in most cases will cover 1 5'x7' pond; you can also make it fit other sizes by cutting it.

✅ TOUGH & THICK POND LINER: This 45 Mil EPDM Pond Liner from Custom Pro is much more durable and thicker than cheap PVC economy liners. It is 45 mil thick. This black rubber pond liner measures 5 feet wide and 5 feet long.

✅ VERY FLEXIBLE: Although strong material, this pond liner can be shaped to fit the contours of your pond or other water feature. It is much easier to install than preformed or rigid pond liners, and it can be cut with scissors.

✅ MANY USES: This waterproof material lines various kinds of ponds, including koi ponds and water gardens. It is also used in fountains, pondless water features, streams, waterfalls and hardscapes.

👍[Safe LLDPE Material 20X20 FT]: The LLDPE material is used for pond liner or blended into other films to give them more flexibility and extra strength; Environmentally friendly, safe for your fish and plant. We provide small to large sizes for different size requests.

👍[Long Last & Durability]: This material is widely used for films that need a tremendous amount of strength to absorb impacts while not tearing or puncturing. Features with well UV resistant, which can hold up to the harsh rays of the sun, and also the tear and puncture resistant.

👍[Flexible & Easy Installation]: The fish pond liner that weighs 30% less than ordinary 20 mil PVC but is just as strong and flexible. Freely Bending or folding, the pond liner can be stretched around corners to fit nearly any pond design. Also you can cut to any size you want for your small pond; Easy to install, no tools required.

Good Material - Pond Liner made from HDPE material provides superior durability while maintaining the ability to stretch, lightweight, malleable, puncture resistant, and long-lasting.

Use - Underneath the beautiful foliage and active aquatic life of your pond lies the product that keeps it functioning effectively, the fish pond liner.

Sturdy - Sturdy yet flexible cloth is easy to place within your pond area. Adds an additional layer of support for your outdoor water feature.

【20X20 FT LDPE Pond Liner】- The pond liner 20x20 is made of LDPE material, compared with HDPE, LDPE is more flexible, it reduce the aging problems caused by creases, more convenient operation. More suitable for conforms to a variety of irregular surfaces such as contour/outline of pond's rocks and waterfalls than HDPE.

【Notice】- 1. Before install, please keep your pond without any sharp object such like stone, to avoid damage pond liner. 2. The rigidity of the pond liner will varies with temperature, It will be more flexible at higher temperature, if you fell it have little difficul to operation, please bask in the sun for a while.Please avoid use in cold environment.

【EASY TO CLEAN】 - Pond liners for outdoor ponds provides a flat surface for your pond and is waterproof without more leaking. LDPE material is environmentally friendly. Also can effectively prevent harmful substances in the soil from penetrating into the pond to pollute the water, so that you can clean the pond easily.

Pond Liner Repair Kit Includes Two Products:

One (1) Handy Pack Size 2.53 fl oz or 75ml, Pond & Aquarium Black Marine Grade Sealant with a very high bond strength and quick cure time. Bonds to most substrates, can be painted over with most types of paint including water based. Does not contain any Isocyanates or harmful solvents. Can be left unpainted without being affected by UV

One (1) Gold Label Pond Liner Repair Patch, 11 Inch x 7 1/2 Inch (280mm x 190mm) Gold Label Pond Liner Repair Patch Pre Cut Butyl Liner Patch Works Well with the Gold label Underwater Sealant Can Cut to Size

Product Size: We have four different sizes for your best choice, 1.5*2m/5*6.6ft; 2*3m/6.6*9.8ft; 2.5*3m/8.2*9.8ft; 3*3m/9.8*9.8 ft. It is easier to install than prefabricated or rigid pond liners and can be cut with scissors.

Material: Made of high-quality high-density polyethylene, lightweight, malleable, lined with UV and puncture resistance, durable, and completely harmless to your fish and plants.

Protect the Pond: This liner will help control your pond, while also creating a safe and healthy environment for wildlife and plants. When the lining is in place, it helps protect your water features, pond pumps, filters, etc.

Durable HDPE Material: The pond liner is made of HDPE material, pro-environmentally, sunlight-proof, weather-proof. It can restrain the penetration of harmful substances into the pond and give your fish and plants a secure living environment.

20 Mil Thickness: This small pond liner is strong enough to withstand extreme weather conditions, more durable, tear-proof, and puncture-proof. In addition, good waterproof performance can effectively retain the water in your pond.

Flexible & Pliable: The fish pond liner has good flexibility, easy to bend and fold. You can cut it in various shapes to fit all irregular surfaces(e.g., waterfalls). For better flexibility, you can place this koi pond liner under the sun for 10 to 15 min before use.

【13*10 FT LDPE Pond Liner】- The pond liner 13*10 FT is made of LDPE material, compared with HDPE, LDPE is more flexible, it reduce the aging problems caused by creases, convenient operation. More suitable for conforms to a variety of irregular surfaces such as contour/outline of pond's rocks and waterfalls than HDPE.

【Impermeable】- 20Mil thickness is good for your pond, This pond liner provides a flat surface for your pond and is waterproof without more leaking. PVC material is environmentally friendly, and completely non-toxic, which is safe for your fish and plant life.

【EASY TO CLEAN】 - This pond liner provides a flat surface for your pond, reducing the soil accumulation. Also can effectively prevent harmful substances in the soil from penetrating into the pond to pollute the water, so that you can clean the pond easily.

[High-Quailty Material] This liners are made of HDPE material,they are durable and strong. It could hold water perfect,thickness and thick enough to line your pond and water plants,HDPE pond liners are safe for fish and long-lasting.

[Can Withstand Bad Weather] Able to withstand the harsh environment, our pond liner is resistant to UV, sunlight and temperature and will not crack at all. Safe for plants, fish and other aquatic life.

[Easy to Use and DIY] It is flexible and light, helps you install this easily,no matter what shape your pond is,this fish pond liner could formed well to the hole,you could bend to your outline of pond's rocks and waterfalls.

【High Quality Material】Pond Liner is made of HDPE. Our material HDPE is more waterproof and leak-proof than other material LDPE. Fish Ponds Liner can resist tearing and piercing by sharp stones. The excellent waterproof performance can reserve the pond water.

【Super Thickness】The thickness of Pond liner is 20 Mil with super preventing leakage. Compared with other 14.5 Mil and 4.5 Mil, our thickness is stronger and more durable. The material is soft and adaptable to ponds of various angles and shapes.

【Sun-Proof & Durable】The 20 mil Pond Liner is Sun Protection and puncture resistant. Koi pond liner can prevent materials from aging in the sun. The HDPE pond liner can resist sharp stones or other objects, and has strong puncture resistance.