Flexible Pond Liner 40yr Guarantee & Half Price Fleece – Sizes 2m x 2m to 50m x 40m
This flexible pond liner offers long-lasting protection for garden ponds of all shapes and sizes.

Where it sits in the pond
- Water
- Pond liner
- Fleece underlay
- Ground, with its stones and roots
- 40-year guarantee for peace of mind
- Flexible material for easy installation
- Optional half price fleece underlay for added protection
- UV and rot resistant for longevity
- Suitable for complex shapes and contours
Find your size
How we work out the size
We add twice the deepest point to the pond’s length and to its width, so the sheet runs down the sides and across the floor, then add 30 cm on every edge to tuck under the edging. We pick the smallest sheet we stock that covers that, either way round.
£35.12 incl. VAT
For one 2m x 2m sheet · SKU FL020X020-40U
Not sure on size? Ask before you order.
Laying it, in four steps
- 1
Shape the hole
Dig the pond with its shelves, then pick out sharp stones and cut back any roots you can see.
- 2
Lay the fleece
Spread the underlay across the hole and press it into the base, the shelves and the corners. Let it run up over the edge.
- 3
Liner on top
Lay the liner over the fleece and start to fill. The weight of the water pulls both layers into shape.
- 4
Trim when it is full
Once the pond is full, trim the liner and the underlay together, leaving enough to tuck under the edging.
Specification
| Material | Flexible pond liner |
|---|---|
| Guarantee | 40 years |
| Optional | Half price protective fleece underlay |
| UV and rot resistant | |
| Available sizes | 2m x 2m to 50m x 40m (93 sizes) |
Used for
- Garden ponds and wildlife habitats
- Koi ponds and ornamental water features
- Stream and waterfall lining
- Raised or formal pond designs
- Large-scale landscaping projects
Questions before you buy
Do I need underlay under the liner?
We would always fit it. Stones work their way up through soil over the years and roots keep growing, and once the pond is full the underside of the liner is the one place you cannot get back to.
My pond is bigger than the largest sheet, or an awkward shape
Our largest sheet here is 50m x 40m. For a bigger pond or an awkward shape, send us the measurements with the Quote button above and we will work out the sheets you need.