Which liner type and underlay should I choose? Which liner type and underlay should I choose?

Choosing the liner material may well depend on your budget but we would recommend you buy the best quality liner you can afford and install it with an underlay, if your liner leaks they can be difficult to repair, and replacement will involve removing all the fish and wildlife from your pond and shutting down and removing all filter systems etc, so it is sensible to spend your money buying a good quality liner and underlay! The following options are available from ValueAquatics:

“Gordon Low” Butyl Liner (our most expensive option)

Our Butyl liners are manufactured by “Gordon Low” in our opinion these are the best quality butyl liners currently available, they are 0.75mm thick, and come with a lifetime guarantee, we strongly advise the use of a suitable underlay when installing this product. We can supply butyl liners as flat sheets or box welded to fit your pond excavation exactly. Butyl liners stretch so if you have an irregular shaped pond then this option will reduce the amount of folds and creases in the liner when installed!

“Gordon Low” EPDM Firestone Liner (less expensive than Butyl)

Our EPDM liners are manufactured by “Gordon Low” in our opinion these are the best quality EPDM liners currently available, they are 1.00mm thick, and come with a lifetime guarantee, we strongly advise the use of a suitable underlay when installing this product. EPDM liners stretch less than Butyl so they are a better option if your pond is a more formal regular shape!

“Gordon Low” PVC Liner (cheaper than the above options)

Our PVC liners are manufactured by “Gordon Low” in our opinion these are the best quality PVC liners currently available, they are 0.5mm thick, and come with a lifetime guarantee, we strongly advise the use of a suitable underlay when installing this product. A PVC liner is less flexible and “stretchy” than the above options!

Which liner best suits my pond?

For an irregular shaped pond:

If your pond is an irregular or complex shape then you should choose Butyl if your budget allows, butyl will stretch so that when your filling the pond to initially install the liner, the weight of water will stretch the liner more than EPDM or PVC, reducing the amount of creases and folds, allowing for a better neater installation!

If the Butyl option is too expensive then go for the PVC option, this liner is thinner than the Butyl and doesn’t stretch so you will end up with more, larger folds and creases, but you will get the same warranty “lifetime of the liner”.

For a regular shaped or formal pond:

Either Butyl, EPDM or PVC will be suitable, again your budget will determine your choice:

In Butyl we can supply box welded liners in any shape or size, a box welded liner is manufacturerd to fit your pond excavation exactly, with a 150cm (6inch) flange if required, around the edge to go under flag stones etc. The advantage of using a box welded liner is that the liner will fit perfectly into your excavation without a single crease. You should get the liner measured an inch smaller than the excavation the liner will then stretch into the excavation for the perfect fit.

The Firestone EPDM liner is a slightly thicker liner than the Butyl, and less “stretchy”, but in a regular shaped rectangular or square pond you will be able to fit this liner withour many folds or creases.

Finally again the PVC will provide the cheapest option, If the Butyl and EPDM option is too expensive then go for the PVC option, this liner is thinner than the others and doesn’t stretch so you will end up with more, larger folds and creases, but you will get the same warranty “lifetime of the liner”.

Choosing Underlay

You must use an underlay when installing your liner as this will protect the underside of the liner from roots and sharp rocks and stones. If you do not use a recognised underlay and your liner leaks then the warranty will be invalidated! An underlay will not bio-degrade and will provide protection for the lifetime of the liner. Because the underlay is supplied in 2 meter wide strips, when installing the liner these will be laid side by side with an overlap of at least 150mm (6in) along each strips edge. Because of this overlap you will need to purchase around 20% more underlay than liner, i.e if you require a 10m x 10m liner (100 square meters), you will require 120 square meters on underlay. We sell underlay per meter, and in bulk 50 square meter rolls, depending on your requirements it may be more economical to buy in bulk.

And Finally the cheapest liner option is:

Blagdon Pondalene Liner

These are a good option for a very small pond especially if you are on a very tight budget, they are available in pre-packs, and represent good value for money.

If you require more information on liner selection please contact us, or telephone 0845 602 7244 (information / order line)

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