Cornelius started in 1967, building steel wall and vinyl liner for inground pools. Cornelius entered the above-ground market in 1971, as the demand for more affordable backyard vinyl liner pools increased. We are known for using innovative materials, functional product design, efficient packaging, and eye catching patterns in both liners and walls. Through the years, we have grown from a regional manufacturer into a large international company with sales all across North America and around the world. During this growth we have expanded our manufacturing equipment and facility to meet this demand.