There are times when you may have to drain your pool - for maintenance or to replace the water after several years of use. Over time, the TDS (Total Dissolved Solids) level in your pool water build up to the point where it's difficult to maintain chemistry. If your pool's TDS becomes too high, you will began to see mineral stains on the pool's walls and floor. Eventually, your pool's surface material might begin to deteriorate if you don't reduce the TDS. Since it can be extremely difficult to lower the TDS level, draining the pool and starting over with clean water is often the best solution. This guide shows you the process for draining your pool. A word of caution. If you are in an area with a high water, you run the risk of having your pool heave out of the ground, especially after several days of heavy rain. If this is the case, you might consider only draining half of the water and refilling it the same day.