Rubber Pond Liners

Pond Liner Calculator

Working out just how much pond liner you'll need to cover your garden pond is a daunting task, but thanks to our handy pond liner calculator you can easily find the right size pond liner for your needs. This pond liner calculator will tell you what size pond liner and pond liner underlay you'll need for your garden pond. Simply enter your pond length, pond depth, and pond width into the pond liner calculator and it'll do the rest of the hard work for you. Don't worry too much about taking exact length, depth, and width measurements, approximate measurements are fine. It's always a good idea to buy slightly more pond liner than you need, rather than an exact size, to make sure you have enough pond liner to cover any hard-to-reach areas of your pond that you may have measured incorrectly.

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Help and advice on shopping for: Rubber Pond Liners

What are rubber pond liners and why are they the best choice for a garden pond?

When it comes to selecting a pond liner to serve as the foundation of your garden pond, you can't go wrong with a rubber pond liner. These flexible yet durable garden pond liners are widely considered the best type of pond liner available.

Most rubber liners are made are made from EPDM (ethylene propylene diene monomer), a synthetic rubber material. This material is strong and supple, making for garden pond liners that are not only incredibly easy to install, but built to stand the test of time too. EPDM doesn’t expand or contract at high/low temperatures either, so temperature differences won’t cause it to lose its grip on your ground’s surface.

Despite their softness, EPDM pond liners are resistant to punctures, UV rays, and general wear and tear. They’re only let down by the fact that they can be quite pricey, but you do get what you pay for – high-quality fish pond liners that are well-suited for both small and large custom ponds!

EPDM isn’t the only type of synthetic rubber material used in some garden pond liners, there’s butyl too. For a long time, butyl rubber pond liners were the most widely used type of fish pond liners in the UK, thanks to their highly flexible, easy-to-mould nature. That said, butyl rubber pond liners aren’t quite as durable as EPDM pond liners and are a little more prone to rips and punctures.

What other types of pond liner are available?

While EPDM and butyl rubber liners are considered the best types of pond liner that money can buy, they're not the only types of pond liner available. There are several different types of garden pond liners out there, including HDPE pond liners and PVC pond liners. We sell both HDPE pond liners and PVC pond liners, in varying sizes and with differing guarantees.

There are many sizes of garden pond liners to choose from, from small pond liners suitable for tiny nature-style ponds, to big pond liners suitable for large ornamental ponds full of fish, like Koi ponds. A large pond liner is often called a lake liner, because of its size. These are typically heavy duty liners designed to cover huge outdoor spaces, often in excess of 20m².

Not all garden ponds have pond liner foundations; some, like preformed ponds, rely on a plastic/carbon-fibre basin to retain pond water. These kinds of ponds may be attractive to new pond keepers for their simplicity, but they don't offer the amazing flexibility that pond liners do. They're also limited by their shape and size, with a maximum depth that cannot be changed. This rules out the use of some pond pumps, pond filters, and water features.

HDPE pond liners: Pros & Cons

HDPE, or high-density polyethylene, is one of the most popular materials. It’s very UV resistant and performs well in cold temperatures, making it a great choice of material for areas with unpredictable weather conditions. It’s also resistant to a wide range of chemicals, so much so that they’re often used in landfills and chemical containment sites. These heavy duty liners are relatively inexpensive too, particularly when compared with alternatives like rubber liners.

HDPE pond liners aren’t without their cons, however. They're fairly stiff and heavy, making them little tougher to install than, say, rubber liners which tend to be more supple and flexible. They can be more prone to punctures and surface scratches than other fish pond liners too, so they need to be partnered with a high-quality protective underlay to ensure they’re well protected from sharp stones and twigs.

PVC pond liners: Pros & Cons

PVC, or polyvinyl chloride, is commonly associated with pipes and plumbing, but it’s also a popular material. It’s one of, if not the cheapest material available. It’s very flexible too and can conform snugly in tight corners and crevices, making it a great choice for nature-style ponds with lots of nooks and crannies.

Where PVC pond liners are let down is in their resistance to UV damage. They’re not quite as UV resistant as HDPE pond liners or rubber liners and are likely to degrade quicker than these alternatives. They’re also prone to cracks and splits in very low temperatures, so use them with caution if you live in an area where it regularly drops below zero.

What size pond liner do I need?

Selecting the right pond liner for your pond is usually quite tough, but with our handy pond liner calculator tool it's made quick and easy. Just measure your pond's length, width, and depth, and input the details into the pond liner calculator.

After a speedy calculation, the pond liner calculator will tell you how much pond water your pond will hold and the minimum size pond liner you'll need to sufficiently cover the base of your pond, whether that be for a small pond or a large pond. It'll also tell you the minimum size protective underlay you'll need.

What is protective underlay and do I need it?

A pond liner is only as good as the protective underlay that lies underneath it. This pond liner underlay, often some form of geotextile fabric, acts as a barrier between the ground around your pond and your pond liner. It protects the pond liner from being punctured or scratched by sharp stones or twigs buried in the ground, and also prevents your pond liner from shifting due to any ground movement. They act as a layer of insulation too.

Some garden pond liners are more durable than others, as discussed above, but no matter what type you have, you should always partner your pond liner with a layer of pond liner underlay. Like pond liners, pond underlay is also available in a variety of sizes and types. Here at Swell UK we stock two types of pond underlay, heavy duty protective underlay or standard protective underlay, and both are available in sizes to fit our pond liners.

We also stock pond liner edging. This is primarily a decorative product, rather than a protective one, but it does help to cover up the edges of your pond liner and shield them from damaging UV rays and other atmospheric agents, like frost.

What does the guarantee on Swell UK pond liners cover?

A lot of our pond liners come with guarantees, ranging from 25-years to lifetime guarantees (these guarantees are stated in the descriptions of specific products). These guarantees cover your pond liners from UV damage one of the main causes of pond liner degradation. All of our pond liners are UV resistant, but these guarantees help to give you, the pond owner, that extra piece of mind.

It’s important to note, however, that these guarantees don’t cover your pond liner from punctures. This in mind, it’s recommended that you purchase a puncture-resistant layer of protective underlay to sit underneath your pond liner and protect it from any rough rocks.

What should I look for in a pond liner?

There’s a lot of variety when it comes to pond liners and picking the type that will work best for you and your pond is a difficult task! That said, there’s a lot of information here to get you started, plus a handy pond liner calculator tool at the top of the page. This pond liner calculator tool will let you know whether you should be shopping for small pond liners or large pond liners. For more advice, check out our FAQ on pond liners and useful help guides on pond building.