We dug out a hole to the shape and depth we measured and checked to make sure
it was level once the liner was placed into the hole. Then we pulled it out again and added a few inches of sand to the bottom of the hole. This will help nestle the liner into the ground and keep it level. Keep adding sand until the liner stays steady without any rocking motion. It’s a good idea to tamp the sand down over the dirt on the bottom so the liner is seated securely. Continue to put the liner back in and check for level as you build up the sand. Making sure the pond is level is the most important step because water won’t stay securely inside the liner, where it belongs, if it’s tilted at all.