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Description
Heavy Duty HDPE Pond Liner
Lifetime Waterproof Protection for Your Garden Pond
UV Protected
£50+ Value
Tear Resistant
Inc. Underlay
💧 TRUSTED BY UK LANDSCAPERS & POND BUILDERS
The Last Pond Liner You'll Ever Need to Buy
Black 0.35mm HDPE pond liner with free underlay
You are digging a pond and want the liner and the protective layer beneath it to arrive together. This listing gives you both: a black 0.35mm HDPE liner with a 40-year guarantee against UV damage, plus free underlay to go under it. The full range runs to 44 pre-cut sizes, from 2.5m x 3m up to 22m x 32m, so it suits a small wildlife pond as readily as a large ornamental pond in commercial grounds.
- In the box: your chosen size of black HDPE liner and free 54gsm black underlay
- Material: HDPE, 0.35mm thick, made from 100% virgin material
- Guarantee: 40 years against UV damage from sunlight
- Handling: very supple, with no stretch, so it folds into shape
- Delivery: Express UK Delivery, large sizes may arrive on a pallet
Why This Outlasts PVC & Rubber Liners
40-Year UV Guarantee
Won't degrade, crack, or fade in British weather – guaranteed for four decades.
- UV-stabilized HDPE formula
- Resists sun damage & weathering
- Maintains flexibility over time
- Outlasts PVC by 3-4x
FREE Professional Underlay
£50+ value included free – protects your liner from punctures and extends lifespan.
- Cushions against stones & roots
- Prevents sharp object damage
- Smooths uneven ground
- Professional-grade protection
Fish & Plant Safe
100% non-toxic HDPE – safe for koi, goldfish, and all aquatic life.
- Chemical-free material
- Won't leach toxins into water
- Safe for wildlife ponds
- Temperature resistant -40°C to +80°C
Perfect For Every Pond Project
🐟 Koi & Fish Ponds
- 100% fish-safe material
- Won't harm water quality
- Flexible for custom shapes
- Resists algae buildup
🌿 Wildlife Ponds
- Safe for frogs, newts & insects
- Natural pond ecosystem support
- Easy to create shallow edges
- Long-term habitat protection
⛲ Water Features
- Ornamental fountains
- Cascading waterfalls
- Garden streams
- Decorative pools
💧 Large-Scale Projects
- Commercial water features
- Agricultural water storage
- Irrigation reservoirs
- Landscape water containment
Why HDPE Beats PVC & Rubber
| Feature | Our HDPE Liner | PVC Liner | Rubber Liner |
|---|---|---|---|
| Lifespan | 40+ years | 5-10 years | 15-20 years |
| UV Resistance | Excellent | Poor (cracks) | Moderate |
| Tear Resistance | Very High | Low | Moderate |
| Flexibility | Excellent | Stiff (cold) | Good |
| Fish Safety | 100% Safe | Contains plasticizers | Safe |
| Price | Best value long-term | Cheap initially | Expensive |
🔧 Easy DIY Installation in 5 Steps
Dig Pond
Create your desired shape & depth
Remove Sharps
Clear stones, roots & debris
Lay Underlay
Cover entire pond base & sides
Position Liner
Unfold & smooth into place
Fill & Trim
Add water, then trim excess
💡 Pro Tip: The flexible HDPE material naturally conforms to your pond shape – no heat gun or special tools required!
Technical Specifications
| Specification | Details |
|---|---|
| Material | Premium HDPE (High-Density Polyethylene) |
| Thickness | 0.35mm (flexible yet tear-resistant) |
| Guarantee | 40 Years UV Protection |
| Temperature Range | -40°C to +80°C |
| UV Resistance | UV-stabilized formula (won't degrade in sunlight) |
| Fish Safety | 100% non-toxic, safe for all aquatic life |
| Included | FREE Professional-Grade Underlay (£50+ value) |
| Sizes Available | 2.5m × 3m up to 22m × 32m (44 sizes) |
| Colour | Black |
| Material type | 100% virgin material |
| Stretch | No stretch, very supple |
| Guarantee cover | UV damage caused by sunlight, not punctures |
| Underlay supplied | 54gsm, black |
| Koi window | Not suitable |
| Tensile strength and weight per m² | Not published for this line |
Why Choose Our HDPE Pond Liner?
Lifetime protection
£50+ value included
100% non-toxic
Fast delivery
Create Your Dream Pond Today
The Last Pond Liner You'll Ever Need to Buy
44 sizes available • 2.5m × 3m up to 22m × 32m
✅ Fast UK Delivery | ✅ 40-Year Guarantee | ✅ Fish Safe
Don't risk your pond investment with inferior liners. Get lifetime protection.
📐 HDPE Pond Liner Size Guide – Which Size Do I Need?
To calculate your pond liner size, add twice the maximum depth to both the length and width, plus 0.5m overlap on each side. Formula: Length + (2 × Depth) + 1m | Width + (2 × Depth) + 1m
| Liner Size | Max Pond Size (approx) | Typical Use | Depth Allowance |
|---|---|---|---|
| 2.5m × 3m | 0.5m × 1m pond | Small garden / wildlife pond | Up to 0.5m deep |
| 4m × 5m | 1.5m × 2.5m pond | Medium garden pond / koi pond | Up to 0.75m deep |
| 6m × 8m | 3.2m × 5.2m pond | Large koi / ornamental pond | Up to 0.9m deep |
| 8m × 10m | 5.2m × 7.2m pond | Large wildlife / commercial pond | Up to 0.9m deep |
| 10m × 12m | 7.2m × 9.2m pond | Large commercial / lake pond | Up to 0.9m deep |
| Custom sizes | Any size | Industrial pond liner / reservoir | Any depth |
✅ Not sure which size? All orders include free heavy-duty geotextile underlay. Contact us and we'll help calculate the right HDPE pond liner size for your project.
Worked size examples
Check your own pond with the sum before you order: liner size = pond size + (2 x deepest point) + 1m, worked out separately for length and width. Dig first and measure the hole rather than the plan. HDPE does not stretch, so for an irregular shape run a tape down one side, across the base and up the other. These examples use the sizes we list:
| Pond (length x width x depth) | Liner needed | Choose |
|---|---|---|
| 1.5m x 1m x 0.5m | 3.5m x 3m | 3m x 4m |
| 2m x 1.5m x 0.6m | 4.2m x 3.7m | 4m x 5m |
| 3m x 2m x 0.75m | 5.5m x 4.5m | 5m x 6m |
| 4m x 3m x 1m | 7m x 6m | 6m x 7m |
| 5m x 4m x 1.2m | 8.4m x 7.4m | 8m x 9m |
| 8m x 6m x 1.2m | 11.4m x 9.4m | 10m x 12m |
| 14m x 10m x 1.5m | 18m x 14m | 18m x 20m |
| Stream, 8m x 0.6m x 0.2m | 9.4m x 2m | 10m x 2m |
If you fall between two sizes, take the larger one. You can trim spare liner once the pond is full, but you cannot add to a sheet that falls short.
Choosing the right liner
Most buyers should start with what the job needs under the liner. This listing suits a well-prepared site where standard underlay is enough. Compare the guarantee and what comes with each liner:
| Liner | Guarantee | Underlay |
|---|---|---|
| This liner, Heavy Duty HDPE | 40 years | Free 54gsm underlay |
| Industrial-Grade HDPE Pond Liner | 25 years | Not included |
| HDPE Pond Liner with Heavy-Duty Underlay | Lifetime | Free heavy-duty underlay |
| Heavy-Duty PVC Pond Liner | Lifetime | Free geotextile underlay |
Choose the 25-year liner if you already have underlay. Move up to a lifetime-guarantee liner if the site is stony or full of roots and you want a heavier layer beneath. None of these guarantees replaces good ground preparation. This liner is not suitable for a koi viewing window.
Fitting tips from the pond trade
- Lay the underlay first. Cover the base and sides, with the pieces overlapping if you need more than one run. It is your main protection against punctures, which the guarantee does not cover.
- Let the liner lie loose. It has no stretch, so never pull it tight into a corner. Form neat folds and let the weight of the water seat it.
- Pick a warm day. The sheet is easier to handle in the warmth, and larger sizes need two or more people.
- Fill slowly. Smooth the sides as the level rises and hold the overlap with smooth stones, not sharp ones.
- Finish the edge properly. Bury it in a trench or cover it with coping so soil cannot wick water out and the sun stays off the liner.
- Treat tap water for fish. Use a pond dechlorinator before you add fish.
You May Also Like
- HDPE Pond Liner with Free Heavy-Duty Underlay – Lifetime Guarantee – our complete pond liner bundle with free heavy-duty underlay included
Frequently Asked Questions – HDPE Pond Liner
What thickness of HDPE pond liner do I need?
This liner is 0.35mm thick, made for garden, koi, wildlife and ornamental ponds and water features on properly prepared ground with the free underlay beneath it. It is thinner than most rubber liners, which keeps it light and easy to fold into shape. Our heavy-duty HDPE liner comes with a 40-year guarantee and is UV-stabilised to prevent degradation from sunlight.
Does this HDPE pond liner come with underlay?
Yes – every order includes a free pond liner underlay. The underlay protects the liner from sharp stones, roots and ground movement, significantly extending its lifespan. It is recommended to always use underlay beneath any HDPE pond liner installation.
Can HDPE pond liner be used for fish and koi ponds?
Yes, our HDPE pond liner is completely fish-safe and non-toxic once installed. It is inert, meaning it will not leach harmful chemicals into the water. It is widely used for koi ponds, aquaculture, and ornamental garden ponds across the UK.
How do I calculate the size of pond liner I need?
To calculate the correct size: measure the maximum length, width, and depth of your pond. Use this formula: Liner Length = Pond Length + (2 × Depth) + 1m overlap. Liner Width = Pond Width + (2 × Depth) + 1m overlap. For example, a 3m × 2m pond with 1m depth requires a liner approximately 6m × 5m.
Is HDPE pond liner UV resistant?
Yes, our HDPE pond liner is manufactured with UV stabilisers that protect against degradation from sunlight. Unlike cheaper PVC liners that can become brittle and crack within a few years, our HDPE liner is rated for 40 years and maintains its flexibility even after prolonged UV exposure.
What underlay is included?
Each liner comes with free 54gsm black protective underlay. It cushions the liner against stones and roots on a well-prepared site. On very stony or root-filled ground, consider our liner sold with heavy-duty underlay instead.
What does the 40-year guarantee cover?
It covers UV damage caused by sunlight. It does not cover punctures, so clear the ground carefully and lay the underlay first. Keep your order confirmation as proof of purchase, and call us on 01744 520 110 if you have a question about a claim.
Can I fit a koi window?
No. This liner is suitable for koi ponds, but it should not be used with a koi viewing window.
How will a large liner be delivered?
Orders placed before 2pm, Monday to Friday, are dispatched the same day by Express UK Delivery. Larger sizes may come on a pallet to protect them in transit, so make sure there is clear access and someone available to help move it.
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