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Pond Liners and Underlays




The first stage of any pond project is excavation (digging a hole!). The next process is to cover the excavation with a pond liner. A pond liner is simply a waterproof fabric that keeps the pond water in the hole. A pond liner is essential as without it the water would simply seep into the ground.

There are 4 types of pond liner, each having their own advantages and disadvantages. We stock PVC, Greenseal EPDM Rubber, Butyl Rubber, and Firestone EPDM Rubber in any size you can dream of, whether you're building a garden pond or a even a lake. We also strongly recommend that our geotextile underlay material is used beneath a flexible liner, not only to help protect it from puncture by sharp stones, roots etc, but also to stabilise soft sub-soils and reduce excessive stretching of the liner.


 Pond Liner


Betta PVC Pond Liners are perfect for building small and medium sized ponds. They are available in a range of pre-cut sizes from 2m x 1m to 8m x 8m. Betta PVC Pond Liners are made from high-quality materials which makes them tough flexible and easy to install. They are highly resistant to UV frost and root penetration. These liners are 0.5mm thick and carry a 25-year guarantee.

Butyl Pond Liners are made from premium, synthetic rubber pond liner recommended by leading European water gardening experts. It has been field tested for more than forty years in hundreds of thousands of installations throughout the world, varying in size from 25sq. ft garden ponds to 4,000,000sq. ft water storage reservoirs. It is remarkably flexible and comfortable, it is safe for all aquatic life, it withstands exposure to artic cold and desert heat, and it will last longer than any other flexible liner underwater and underground.

The main component of Firestone EPDM is a single-ply synthetic rubber waterproofing geomembrane made of ethylene – propylene – diene terpolymer, mixed with carbon black, oils, curing agents and processing aids. It is calendered into large sheets and vulcanized.


 Our Recommendation :


Greenseal Liner 


Greenseal Pond Liners are made from an exceptional top quality material from the same manufacturers of Butyl Rubber, offering a full Lifetime guarantee against any latent manufacturing defects.

Greenseal EPDM (ethylene propylene diene terpolymer) is a synthetic rubber similar to butyl and manufactured in Sweden by Trelleborg. As a material, Greenseal Rubber has superior properties to Butyl and cheaper, making it both an attractive and economical solution for any koi pond project.

Greenseal Pond Liners unique elasticity makes a rubber membrane the best choice for lining ponds. Greenseal Pond Liners are not affected by UV light, temperature or age.

The Greenseal Pond Liner is chemically stable when coming into contact with chemicals in the soil and other materials. It will withstand root penetration and rodent attack. The rubber membrane should be protected by a geotextile. Greenseal Pond Liner material is slightly embossed or textured in appearance.



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Gold label Underwater Sealer will do exactly what the name says, it is remarkable and it will seal everything and everything, stainless steel to stainless steel, it will stick steel to plastic, plastic to wood, wood to stone, stone to plastic and what’s more as the name suggests it can be used underwater.

No longer need you worry about sealing that Pond liner and installing a Bottom Drain use this remarkable sealant and it will never leak, in fact you would have to break the bottom drain to be able to remove it, repair instantly a cut in the liner below the water level, if you can reach it then you can seal it without any worries whatsoever.

Mastic Pond Liner Tape is designed for repairing holes in Butyl rubber and PVC pond liners. The tape is also ideal for sticking down unsightly liner creases that can appear in the pond.

This double sided tape is extremely sticky.

The Butyl Mastic Tape is 50mm (2 inch) wide and sold in 1m increments. Simply select the quantity of metres you wish to order.