The Swell HDPE Pond Liner 25-Year Guarantee With Heavy Duty Underlay is one of our best-selling pond liners. These garden 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 heavy duty protective underlay provided, forms a great base for a quality pond. Our garden pond liners are easy to fit, whether they're small pond liners or large pond liners. 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! 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 25-year guarantee. 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 your supplied layer of heavy duty protective underlay prior to installing your pond liner. This heavy duty pond liner underlay protects garden pond liners from sharp stones and, in doing so, reduces the likelihood of leaks. Like the pond liners themselves, this heavy duty underlay is flexible and very easy to fit.
