One of the most important things that any owner of a vinyl liner pool needs to know is that you should NEVER drain your vinyl liner swimming pool. The water in the pool helps hold the liner into place. If you do drain your pool you can cause your vinyl pool liner to shrink ,upon refilling if the liner has lost its elasticity it can cause the liner to rip or tear. The liner can also become hard and brittle. The older the vinyl material is the more likely this is to happen. If you do have to patch a hole or puncture, you will not need to drain your pool as most vinyl repair kits are designed to work under water. Also if you drain too much water out of an above ground pool, it can lead to the pool wall collapsing. You can help protect the life of your liner by not draining your pool.