Hi - I need some advice on what to do with a pool that is no longer being used. My parents no longer use their pool, but want to keep it as an asset, if they ever sell the house. Should they just leave it covered, full of water? Should they drain it down, half-way? should they drain it all the way? (or will the walls/sand just fall into it). Should they throw chemicals in once a year? Any advice would be greatly appreciated. John