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Dig a hole to 45cm deep. Knock in 60cm-long pegs around the edges and screw 2cm-thick retaining boards to them. Frame the edges with timber, screwed to the top of each peg.
Use a spirit level and long plank to check that all sides of the hole are level. If they aren't, the liner will show and spoil the look.
Add extra soil to one side of the hole to create a long, sloping marginal shelf. Firm this down using your heels to make sure it is compacted, then rake level.
Check the depth of your marginal shelf with your potted aquatic plants. The surrounding edge of the pond should be around 2-3cm above the pot's rim.
Remove any sharp stones from the soil, then line the hole with protective underlay, such as the geo-textile liner or offcuts of carpet.
Lay the pond liner over the hole and, with shoes off, climb in and push the liner into every nook, pleating it for a neater finish. Allow a 15cm overlap at the edges.
Fill your pond, preferably with rain water, left to fill up naturally, or from your water butt. If you need to use tap water, leave it to stand for a week, to allow the chlorine to evaporate.
When filled, trim liner and underlay together leaving 10-15cm of overlap. Fold over the corners ready to fix on the planks.
Lay lengths of decking over the four edges of the pond, parallel to the sides. Mark and cut where the planks overlap.
Cut to size then drill through the decking edge and liners into the edging frame, beneath. (Use a residual current device for safety.) Pull the liner taut to creat a neat finish then, using long brass screws, fix the planks in place.