Before the liner arrives
Ensure the pond excavation is complete, smooth and free from sharp stones, roots or debris. Fit a geotextile underlay — this protects the liner from below and is strongly recommended for all pond types. For raised ponds, ensure the walls are structurally complete.
Installation steps
- 1Unfold the liner — Carefully unfold the liner on a clean surface next to the pond. Take care not to drag it across rough ground.
- 2Lower it in — With a helper, lower the liner into the pond. The box-welded shape means it will naturally orientate itself correctly. There is no folding or pleating required.
- 3Seat the base — Press the liner gently into the base, ensuring it lies flat against the underlay. Work from the centre outwards to avoid trapping air underneath.
- 4Position the walls — Allow the liner walls to fall naturally against the pond walls. For a box-welded liner, this requires no adjustment — the liner is already the right shape.
- 5Fill slowly — Begin filling. The weight of water will settle the liner firmly against the walls. Check regularly that the liner is sitting correctly as the water level rises.
- 6Secure the lip — Fold the lip allowance over the top edge of the pond. Hold in place temporarily with edging stones while you complete the coping detail.