My in-ground vinyl lined pool is a swamp! Can I empty it, scrub the liner, and refill it? This could be a very expensive error. You do not want to empty an in-ground vinyl liner pool for several reasons. If you empty the pool the liner will contract and shrink. When you re-fill the pool you could have wrinkles in the liner, and it may not expand back to its previous shape. Also it has a high chance of tearing. Depending on the underlying infrastructure of your pool construction it is also possible that you could have structural issues such as walls shifting or bowing. It is the pressure of the water that helps keep the walls in place. Shock treatments, proper water chemical balance and filtration will clear the swampy water.