AllPondSolutions Pond Liner 8 x 5m HDPE 300gsm 40yr Warranty

AllPondSolutions is proud to offer our own branded range of pond liners. This is our heavy-duty HDPE liner at a true 300 grams per square metre, made from 100% virgin polyethylene with a 5% carbon black UV stabiliser.

At 8 x 5m, or 40 metres squared, this gives a pond of roughly 5m by 2m at a full 1.2m deep. The long, narrow plan works well where a pond runs along a terrace or boundary, and it gives you a generous length of viewing edge rather than a wide expanse you can only see across.

Not sure what size you need?

Before you order, it is worth two minutes with our pond liner size calculator. Put in your pond length, width and depth and it will tell you the liner size to buy. A liner that is even slightly short on one side cannot be rescued once the pond is dug, so it is the one thing worth checking twice.

Filtration and volume

Dug to 1.2m, a pond this size holds around 8,000 litres. Every pond needs filtration, whatever its size, and the right filter depends on your volume and how heavily you stock it rather than on the liner. Our pond filter size recommender and pond pump size calculator will work it out from your own measurements, and the instruction leaflet packed with every liner covers the same ground.

Why we quote the weight, not the thickness

Almost every pond liner in the UK is sold on a nominal thickness figure. Weight is the measure you can actually verify. Cut a square exactly 500mm x 500mm from the sheet, put it on kitchen scales, and it will read 75 grams. Nothing else in this category invites that test.

Solid and smooth, not woven

Many liners sold as HDPE are reinforced woven sheet. The weave shows as a grid pattern through clear water and cut edges can fray. Ours is solid extruded film, so you get a clean black finish and nothing for water to track along if the liner is ever pierced.

Working out the size yourself

Take your pond length and add twice the depth, plus 60cm. Do the same for the width. The extra 60cm leaves a 30cm overlap all the way round to anchor the edges. Always round up to the next size, because you can trim a liner but you cannot add to one.

• Liner size: 8 x 5m (40 metres squared)
• 300 g/m2 solid smooth HDPE, approximately 0.32mm
• 100% virgin high-density polyethylene resin
• 5% carbon black UV stabiliser for long outdoor life
• 50% more material than liners commonly sold as 0.3mm
• Joined with a heat-welded seam, as our maximum extrusion width is 2.1m
• Flexible and straightforward to fit, and easy to trim once in position
• Black finish, supplied folded in its own box
• Free pond building advice sheet with every liner
• 40 year guarantee against UV degradation*

*Guarantee covers UV degradation of the liner material and requires a non-woven underlay to be fitted beneath it. It does not cover punctures, tears or damage caused during installation, by animals or by ground movement. This guarantee is in addition to your statutory rights.