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200gsm Black Flexible Pond Liner with Underlay, 3m x 3m

200gsm Black Flexible Pond Liner with Underlay, 3m x 3m

Regular price £12.89
Regular price Sale price £12.89
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100 in stock

  • Build your garden pond: a 3m × 3m nominal sheet of flexible 200gsm PE for the water-holding layer.
  • Follows your pond's contours: flexible polyethylene fits around curves, shelves and changes in depth without a rigid preformed shape.
  • Black face with grey reverse: UV-resistant PE for outdoor ponds and garden water features.
  • Underlay included: 1 separate 3m × 3m sheet of 50gsm fabric for laying beneath the liner.
  • One liner supplied: cut-size tolerance ±5%. Allow for depth and edging; prepare smooth ground and remove sharp debris before fitting.
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Description

A square sheet for a pond shaped your way

Start with one nominal 3m × 3m PE liner and the included 50gsm fabric underlay. The flexible sheet can follow curves, planting shelves and changes in level in a prepared pond excavation. Its square outline gives equal material dimensions in both directions, without fixing the shape of the finished pond.

3m × 3mNominal liner cut size
9m²Flat liner area
200gsm PEBlack face, grey reverse
50gsmFabric underlay included

Turn a flat-sheet measurement into a fit check

The 9m² figure is the nominal area of the liner laid flat. Part of that sheet will cover the pond's depth and side walls, with more needed for shelves and the perimeter finish. It is not a 3m × 3m water-surface allowance.

Measure the longest and widest routes along the actual excavation contours, add the allowance for your edging, then compare both routes with the sheet dimensions. Check both even when the pond looks round or symmetrical. Allow for the ±5% cut-size tolerance before ordering.

3m3m9m²nominal flat liner areaCut size ±5% · not the finished pond size

Give the liner a carefully prepared base

Fit the fabric underlay beneath the PE sheet. Plan both layers around the pond contours before filling, rather than pulling the liner tight to make it reach.

Illustrative preparation of black PE liner with grey reverse over fabric pond underlay
Illustrative preparation. Liner and fabric underlay are included; landscaping and installation accessories are not.

Remove sharp objects

Clear stones, roots and debris from the base, sides and shelves. Smooth the supporting surfaces before placing the fabric.

Plan the underlay coverage

Arrange the fabric and any overlaps for the excavation. It is a lightweight layer, so assess whether the actual ground conditions need additional protection.

Position without tension

Ease the liner into the pond contours, leaving material at the perimeter. Check its position before filling and finishing the edges.

What the bundle contains

One nominal 3m × 3m 200gsm polyethylene pond liner with 50gsm fabric underlay. The liner is UV-resistant for outdoor pond use and has a black face with a grey reverse. Edging, stones, plants and installation accessories are not included.

These are two separate materials: 200gsm describes the liner's weight per square metre and 50gsm describes the fabric's. Neither is a thickness measurement, and the ratings do not make this a 250gsm liner. The liner is PE rather than EPDM rubber.

Questions about the 3m square bundle

Can a square liner follow a curved pond?

Yes. The sheet is flexible and can follow a prepared curved excavation. Its cut outline does not fix the pond shape. Measure the full routes along the contours, including depth and edging, to check the fit.

Is the underlay included in this bundle?

Yes. You receive 50gsm fabric underlay with one nominal 3m × 3m PE liner. Plan fabric coverage and any overlaps, and check protection for the actual ground conditions.

Can this line a pond with a 3m × 3m opening?

Do not choose it from the opening dimensions alone. Depth, sides and the edge finish require additional material in both directions. The stated 3m × 3m is the nominal flat cut size, with a ±5% tolerance.

Product information & technical details

SKUPLB3X3-001+
Product typePond Liner with Underlay
Size3m x 3m
Length3m
Width3m
GSM200gsm
ColourBlack, Grey
MaterialPolyethylene (PE)
Nominal flat liner area9m²
Included underlay1 × 3m × 3m sheet of 50gsm fabric; separate pieces, allow for overlaps.
Cut-size tolerance±5%

Quantity supplied: one liner with fabric underlay. Intended use: ponds.

All delivery times are estimates and not guaranteed. Orders placed before 1 pm, Monday to Friday (excluding bank holidays), will be dispatched the same day, while orders placed after 1 pm will be dispatched by the end of the next working day.

If an invalid postcode or address is provided, the order will be cancelled without further notice, as we are unable to modify addresses or print labels for invalid postcodes.

Our standard delivery option is Royal Mail Tracked 48, which typically takes 3–5 business days. If you need your order more quickly, Expedited delivery via Royal Mail Tracked 24 is available, offering a 1–2 business day service.

Large or bulky items may be sent via courier at our discretion and are usually dispatched for next-day delivery. Please note that we only ship to mainland UK addresses; delivery to non-mainland locations, including the Highlands & Islands, may not be available for large or heavy items. If your address falls into one of these areas and you wish to purchase such items, please contact us with your postcode and order details before placing your order. If we cannot ship to you, you are welcome to arrange your own courier for collection.

Please see our shipping policy for further information.

All products, unless otherwise stated, come with a standard manufacturer warranty against faulty workmanship.

If your product fails within six months of delivery, please contact us with your order reference number, a description of the issue, and clear images illustrating the fault.

Should your item require a return for further investigation, it is your responsibility to arrange and cover postage back to us.

If we are unable to repair the fault, we may offer either a replacement or a full refund.

In cases where the item is inspected and found not to be faulty, or where damage is determined not to be due to manufacturing defects, you will not be entitled to a refund or replacement. We will then either return the item to you via standard post or dispose of it at your request.

Please see our warranty policy for further information.

You may return any order within 14 days of delivery. As soon as you receive your items, please inspect them carefully, taking reasonable care to keep both the product and its packaging clean and undamaged. If you discover an error or defect after 14 days, we reserve the right to decline your return. If your product fails or breaks after this 14-day time window then your order may be eligible for a warranty claim, please see our warranty information for more details.

To initiate a return, please contact us via our contact form to obtain a return authorisation and the correct returns address (different from the address on your invoice). This can also be done through your 'recent orders' page on your account if you are registered with Shop. Returns sent without prior authorisation will be discarded.

Returned items must be in the same condition in which you received them: unworn or unused, with tags attached and in their original packaging. You must include either a copy of your invoice or a slip with your order reference number inside the parcel. Please be sure not to obscure your return reference number on the label.

If you refuse delivery or reject the parcel without prior notice, we will inspect the returned package and issue a refund upon receipt. Although there is no restocking fee, we will deduct the cost of the return postage label (£3.35) from your refund.

If the returned item or its packaging shows signs of use, damage, or staining, we may deduct up to 50% of the order value, or refuse the return entirely, depending on its condition. Examples include damaged tags, stained, modified or damaged packaging, or missing components.

For faulty, incorrect, or damaged items, please contact us before sending anything back so we can attempt to resolve the issue directly. If we agree that a return is necessary due to our error, we will provide you with a pre-paid return label.

Products that have been modified or damaged through customer action are not eligible for return. This includes, but is not limited to, items that have been cut, trimmed or otherwise altered (such as a tarpaulin or pond liner resized to your specifications), or any product showing damage beyond normal inspection handling.

Please see our refund policy for further information.

All delivery times are estimates and not guaranteed. Orders placed before 1 pm, Monday to Friday (excluding bank holidays), will be dispatched the same day, while orders placed after 1 pm will be dispatched by the end of the next working day.

If an invalid postcode or address is provided, the order will be cancelled without further notice, as we are unable to modify addresses or print labels for invalid postcodes.

Our standard delivery option is Royal Mail Tracked 48, which typically takes 3–5 business days. If you need your order more quickly, Expedited delivery via Royal Mail Tracked 24 is available, offering a 1–2 business day service.

Large or bulky items may be sent via courier at our discretion and are usually dispatched for next-day delivery. Please note that we only ship to mainland UK addresses; delivery to non-mainland locations, including the Highlands & Islands, may not be available for large or heavy items. If your address falls into one of these areas and you wish to purchase such items, please contact us with your postcode and order details before placing your order. If we cannot ship to you, you are welcome to arrange your own courier for collection.

Please see our shipping policy for further information.

All products, unless otherwise stated, come with a standard manufacturer warranty against faulty workmanship.

If your product fails within six months of delivery, please contact us with your order reference number, a description of the issue, and clear images illustrating the fault.

Should your item require a return for further investigation, it is your responsibility to arrange and cover postage back to us.

If we are unable to repair the fault, we may offer either a replacement or a full refund.

In cases where the item is inspected and found not to be faulty, or where damage is determined not to be due to manufacturing defects, you will not be entitled to a refund or replacement. We will then either return the item to you via standard post or dispose of it at your request.

Please see our warranty policy for further information.

You may return any order within 14 days of delivery. As soon as you receive your items, please inspect them carefully, taking reasonable care to keep both the product and its packaging clean and undamaged. If you discover an error or defect after 14 days, we reserve the right to decline your return. If your product fails or breaks after this 14-day time window then your order may be eligible for a warranty claim, please see our warranty information for more details.

To initiate a return, please contact us via our contact form to obtain a return authorisation and the correct returns address (different from the address on your invoice). This can also be done through your 'recent orders' page on your account if you are registered with Shop. Returns sent without prior authorisation will be discarded.

Returned items must be in the same condition in which you received them: unworn or unused, with tags attached and in their original packaging. You must include either a copy of your invoice or a slip with your order reference number inside the parcel. Please be sure not to obscure your return reference number on the label.

If you refuse delivery or reject the parcel without prior notice, we will inspect the returned package and issue a refund upon receipt. Although there is no restocking fee, we will deduct the cost of the return postage label (£3.35) from your refund.

If the returned item or its packaging shows signs of use, damage, or staining, we may deduct up to 50% of the order value, or refuse the return entirely, depending on its condition. Examples include damaged tags, stained, modified or damaged packaging, or missing components.

For faulty, incorrect, or damaged items, please contact us before sending anything back so we can attempt to resolve the issue directly. If we agree that a return is necessary due to our error, we will provide you with a pre-paid return label.

Products that have been modified or damaged through customer action are not eligible for return. This includes, but is not limited to, items that have been cut, trimmed or otherwise altered (such as a tarpaulin or pond liner resized to your specifications), or any product showing damage beyond normal inspection handling.

Please see our refund policy for further information.