Protect your investment with some liner pad and pool cove. Two great manufacturers of pool pad like the Armor Shield by GLI Pool Products and Horizon products. Both protect above ground pools and pool liners from rocks, roots and even GLASS! Installs quickly and easily, once you have prepared the site where your pool will be set up. Rocks, stones, nut grass, and other objects in the ground below your pool can easily puncture unprotected pool liners and cause leaks. This is an out of the box pre-cut revolutionary bottom system that will virtually eliminate pool liner problems. Don't let your above ground pool go unprotected.