Swell HDPE Pond Liner 40-Year Guarantee With Free Underlay

Supple pond liners suitable for most types of garden ponds

At a glance...
  • 0.35mm-thick HDPE pond liners
  • Supple, UV resistant and comes with 40-year guarantee
  • Available in a wide variety of sizes
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Palletised delivery

Large sizes may be delivered on a pallet for protection in transit.

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What are these pond liners?

The Swell HDPE Pond Liner 40-Year Guarantee With Free Underlay is our best-selling pond liner. These pond liners are made from a flexible 0.35mm-thick HDPE (high density polyethylene) material that, while not quite as thick as rubber pond liners, is similarly durable. It's also UV resistant and, when paired with the standard protective underlay provided, forms a great base for a quality pond.

These garden pond liners are available in a range of sizes to suit your needs. Just select the right size liner for your pond using the handy dropdown menu at the top of the page. We stock 20 different sizes of these flexible pond liners, from small pond liners measuring 2.5x2.5m to big pond liners measuring 30x40m.

What size pond liner do I need?

It's often tough to select the right pond liner for your pond, but with our handy pond liner calculator tool this entire process is made quick and easy. Just measure your pond's length, width, and depth, and input the details into the pond liner calculator.

This pond liner calculator will not only tell you how much pond water your pond will hold, but also the minimum size pond liner you'll need to sufficiently cover the base of your pond. There's no need to worry about the size of your pond liner underlay as we'll select the right size to match your pond liner right here at our warehouse.

Are these pond liners easy to fit?

Yes, these garden pond liners are easy to fit. Their HDPE make-up makes them flexible pond liners that are well suited to a wildlife pond or sculpted garden ponds like Koi ponds. They also create a great seal, keeping pond water where it should be - in your pond!

How durable are these pond liners?

These heavy duty liners are incredibly durable and built to stand the test of time. In fact, we're so confident in the durablity of these fish pond liners, and the HDPE they're made of, that we've given them a 40-year guarantee. 

This 40-year guarantee covers your pond liner against damage from sunlight. It doesn't, however, cover damage from punctures so it's highly recommended that you lay down your free layer of standard protective underlay prior to installing your pond liner.

This pond liner underlay protects pond liners from sharp stones and, in doing so, reduces the likelihood of leaks. Like the pond liners themselves, this protective underlay is flexible and very easy to fit.

Why should I buy a HDPE pond liner?

There are many different kinds of fish pond liners out there, but the three main types are HDPE pond liners, PVC pond liners, and rubber pond liners. These materials have their own pros and cons, so it's important to be aware of these prior to purchasing.

If you're looking for a large pond liner, or a lake liner, then HDPE is the way to go. This material is not only resistant to UV radiation, but a wide range of chemicals too. This, combined with the fact that it's a cheaper material, make it an incredibly popular choice for big ponds.

While flexible, HDPE pond liners aren't quite as supple as rubber pond liners. They're still easy to install, but they're not quite as suitable for ponds with lots of small nooks and crannies. They're also heavier than rubber pond liners and PVC pond liners.

What else do I need to buy with this pond liner?

These quality pond liners come with a free layer of standard protective underlay, but for added piece of mind you may want to pick up some pond sealer, pond liner patches, and/or pond liner repair tape. These products will protect your pond liner against general wear and tear, ensuring that pond water stays in your garden pond year-round.



Material HDPE
Thickness 0.35mm
Colour Black
Liner suppleness Very
Liner stretchiness No stretch
UV resistant Yes
Guarantee 40 years
Underlay included Yes
Underlay type Standard
Underlay colour Black
Pond sizes Small-large
Koi window compatibility Not suitable
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