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Underlay for Pond Liners

underlay Essential to preserve the durability of your liner. Our liners are only guaranteed when an aquatic underlay is used.


Choose your Underlay below:


Click the price to add the item to your shopping basket, or click the more info link for more details.

pond liner quality suitable for pond  
length width best basic length width  
3m 3m £13.95 £8.91 0m 0m more info
4m 3m £18.60 £11.88 1m 0m more info
4m 4m £24.80 £15.84 1m 1m more info
5m 4m £31.00 £19.80 2m 1m more info
5m 4.5m £34.88 £22.28 2m 1.5m more info
5m 5m £38.75 £24.75 2m 2m more info
6m 4m £37.20 £23.76 3m 1m more info
6m 4.5m £41.85 £26.73 3m 1.5m more info
6m 5m £46.50 £29.70 3m 2m more info
6m 6m £55.80 £35.64 3m 3m more info
7m 5m £54.25 £34.65 4m 2m more info
7m 5.5m £59.68 £38.12 4m 2.5m more info
7m 6m £65.10 £41.58 4m 3m more info
7m 6.5m £70.53 £45.05 4m 3.5m more info
7m 7m £75.95 £48.51 4m 4m more info
7.5m 7.5m £87.19 £55.69 4.5m 4.5m more info
8m 6m £74.40 £47.52 5m 3m more info
8m 7m £86.80 £55.44 5m 4m more info
8m 8m £99.20 £63.36 5m 5m more info
9m 6m £83.70 £53.46 6m 3m more info
9m 7m £97.65 £62.37 6m 4m more info
9m 8m £111.60 £71.28 6m 5m more info
9m 9m £125.55 £80.19 6m 6m more info
10m 10m £155.00 £99.00 7m 7m more info
10m 7m £108.50 £69.30 7m 4m more info
10m 8m £124.00 £79.20 7m 5m more info
10m 9m £139.50 £89.10 7m 6m more info
11m 10m £170.50 £108.90 8m 7m more info
11m 8m £136.40 £87.12 8m 5m more info
11m 9m £153.45 £98.01 8m 6m more info
12m 10m £186.00 £118.80 9m 7m more info
12m 8m £148.80 £95.04 9m 5m more info
12m 9m £167.40 £106.92 9m 6m more info
13m 10m £204.60 £130.68 10m 7m more info
14m 10m £223.20 £142.56 11m 7m more info
15m 10m £232.50 £148.50 12m 7m more info

The pond sizes are recommended for ponds with 1 metre depth.


Consider buying a underlay larger than you think you might need - it's easy to be over enthusuastic when digging! And the liner can always be cut down to size.


Pond Liner Calculator

calculatorUse our pond calculator. This handy tool automatically calculates the size of liner you will need from your pond measurements.


If you need any help or further information please contact us.


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Pondkeeper are UK suppliers of pond liners, underlay, pond pumps, filters and other pond equipment and water garden accessories.