Swell HDPE Pond Liner 25-Year Guarantee

What are these pond liners?

The Swell HDPE Pond Liner 25-Year Guarantee is one of our best-selling pond liners. These garden pond liners are durable, flexible liner made from 0.35mm-thick HDPE (High-Density Polyethylene). It’s UV-resistant and, when paired with protective underlay (sold separately), forms a solid base for your garden pond. While not as thick as rubber, HDPE offers great reliability and is easy to install.

Available in 20 sizes, from small 2.5x2.5m liners to large 30x40m liners, you can easily find the perfect fit for your pond. Select the right size using the dropdown menu above to get the ideal liner for your needs.

What size pond liner do I need?

Selecting the right pond liner is made simple with our pond liner calculator. Just measure your pond's length, width, and depth, and input the details into the pond liner calculator.

This pond liner calculator will tell you the minimum size pond liner you'll need to sufficiently cover the base of your pond, as well as the recommended underlay size for added protection.

Are these pond liners easy to fit?

Yes, the Swell HDPE Pond Liners are easy to fit, whether small or large. Their flexibility makes them suitable for both wildlife and sculpted garden ponds, like Koi ponds. The material ensures a tight seal, keeping water securely in the pond.

How durable are these pond liners?

Built to last, these heavy-duty liners are backed by a 25-year guarantee against UV damage. This 25-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 a layer of protective underlay prior to installing your pond liner.

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 butyl 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, makes it an incredibly popular choice for big ponds.

While flexible, HDPE pond liners aren't 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.