Why density matters in pool cove: Water pressure on the cove is directly proportional to the depth of the water. The deeper the water, the more pressure on the cove. The higher the density, the lower the amount of air in the cove. Air will compress over time, resin won't.
If the cove flattens over time, the liner will become stressed and possibly even pull on the wall structure. Economy is rated 1.6 pounds per cubic foot. Economy pool cove is available in 48 lengths and offers peel & stick convenience. Blue Wave 48-in Peel and Stick Above Ground Pool Cove.