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Pond Liner Guide

Flexible Pond Liner Guide

Pond Liners

Flexible pond liners are a popular and cost-effective, easy way of installing a garden pond. Pond Liners come in multiple prepacked sizes, or can be cut to size, allowing you to create any size dream water garden or lake. Shaped Preformed Pond liners are popular in smaller gardens for ease of installation and where folds are not desirable.


Which Pond Liner Should I Use?

Flexible Sheet Pond Liners

The UK's most popular and highly durable pond liners are rubber-based, including EPDM, Firestone and Butyl liners. PVC pond liners being less expensive, are ideal for smaller garden ponds.
World of Water offers a wide range of pond lining materials, including Firestone RubberEcoSeal Greenseal EDPM, Butyl Rubber and PVC

Preformed Shaped Pond Liners 

Shaped preformed ponds come in a range of formal and informal shapes and sizes. Preformed ponds are tough, relatively easy to install and will have no visible creases. Manufactured from fish safe heavy duty plastics or fibreglass. View our ranges from Top Brands including Lotus, Blagdon, Oase and Pond Products UK


Flexible Pond Liner FAQs

What Thickness Pond Liner do I need?

The quality and thickness of a liner will reflect in its durability and life expectancy.
When considering pond liner thickness, consider the possibility of root damage or unwanted traffic from pets or wildlife entering the pond. If likely, we recommend our best pond liner, 1mm Firestone Rubber Pond Liner, installed with underlay protection.
If building a pond in a formal design, you may want any folds to be less intrusive. Using a thinner, highly flexible 0.75mm rubber liner such as EcoSeal or Butyl will achieve a neater finish. For a perfect finish, it is possible to have a pond liner box welded to eliminate the need for any folds. Contact us for more information.

TIP: Intricate pond designs are time-consuming to build, especially when liners are built into walls, waterfalls, etc. Using a cheaper, thinner liner can be a false economy as any replacement would involve a near-complete pond rebuild.
Note: Pond liner warranties only cover manufacturer failure and do NOT cover any damage caused by external factors or poor installation. Check individual manufactures installation guides and check out our pond liner installation guide before you start.

What should I put under my pond liner?

Pond liners are great at containing water. However, once filled, a pond is heavy, making the liner vulnerable to jagged edges or sharp stones in the substrate below. The liner also needs protection from any aggressive roots.
Do I need to use a pond underlay? Yes,
we recommend a Geotextile Pond Underlay, a high quality, non-woven, mechanically bonded, needle-punched, polypropylene geotextiles. Geotextile underlay offers exceptionally high performance and provides a highly effective protective barrier between substrate and pond liner. Using underlay helps protect the pond liner from sharp stones, roots, etc and reduces excessive localised stretching of the liner when ground settlement occurs over time.
Can I use sand under my pond liner? Sand can be a helpful substrate for levelling off and shaping your pond, but it will offer little or NO protection from roots, and sharp stones that could work there way through the sand over time.
Can I use carpet under my pond liner? We regularly get asked if an old carpet is a suitable alternative to a Pond Liner Underlay. A man-made carpet may offer limited protection, but it will depend on its construction and weave to its ability to stop sharp objects and lifespan before it breaks down.
Can I use newspaper under my pond liner? No, we would not recommend newspapers as liner protection. They will quickly become wet and rot, while any root would work there way through.

Pond Underlay Tips?

TIP: A Geotextile Pond Underlay system is an inexpensive component in any garden pond scheme offering peace of mind protection. It is light and easy to handle and won't break down over time. We would always recommend this over a used carpet.

Best Flexible Pond Liner Review

PVC Pond Liners
Best For Budget

Oase Alfafoil PVC Pond Liners (0.5mm Thick) A fantastic value fish safe liner ideal for smaller, simpler ponds less likely to be exposed to damage from pets and children. Features include UV and Rot resistant, flexible with a 15 year Guarantee.

Firestone Pond Liners
For Maximum Durability

Firestone Rubber Pond Liner: (1mm Thick) Firestone liner is durable and perfect for small to large pond projects. Although this liner is more expensive, its longevity and durability are certainly worth the investment and peace of mind.

EcoSeal EPDM Pond Liner
For Flexibility & Durability

Greenseal EcoSeal EPDM Pond Liner:  (0.75mm Thick | 1mm thick option available to order) Ecoseal is exceptionally flexible and a fish safe liner. It is manufactured from synthetic rubber, giving it exceptional physical properties which are ideal for garden and koi ponds, water features and streams alike. Ecoseal is widely used in building and civil engineering and can be fabricated to huge sizes for projects such as lakes or lagoons.

Butyl Rubber Pond Liner

Butyl Pond Liner: (0.75mm Thick) Butyl pond liner was always considered the best premium pond liner available. However, most landscapers now prefer the SealEco EPDM (Greenseal) pond liner, which is cheaper and has superior specifications. Butyl pond liner is available to order in single sheet sizes up to 1800m2. Butyl rubber liners carry a lifetime guarantee on sizes up to 140m2 and a 20-year warranty on larger sizes. We can also offer a fabrication service for unique shapes and box-welded liners to your requirements

How To Pond Guides

Check out our pond guides to answer all your design, installation, maintenance and pond health questions

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