THE LAGOON ORNAMENTAL POND LINER: THE LAGOON $229.99 SKU: OPL108 QTY: Click here to save 5% off of your order! THE LAGOON  7' x 7' x 18 Deep  Gallons: 473  Cir: 24' 8  30 mil Black PVC Fish Grade Liner  Liner sq. ft. 42' area sq. ft. 49' ORNAMENTAL POND LINERS Preformed foldable pond liner systems. The liner comes with a template which makes finding the right location easy; you can see what the shape physically looks like. The template also makes digging out the design easy, you just mark out the template and follow the inside area. This is perfect for the do it yourself person and great for installers because installation would be fast and pre-ordering materials for the project would be easy, all liners come with the specifications needed to do the project.