hey, what's a pool cove?
Pool Cove is a wedge shaped foam piece that goes at the bottom of the pool wall before the liner goes in. It prevents the liner from potentially slipping under the pool wall. The pool cove is a quick and easy product that replaced manually building up a wedge with the sand that goes under the pool liner.
There is an image of the product on the Options Tab: https://www.poolsandstuff.com/belize-18ft-52-round-pool-kit.html#tab_4