Constant evaporation leaves minerals behind in your pool. As the minerals build up so does the level of dissolved solids and the waters hardness. When this happens, it becomes difficult to maintain a proper balance of chemicals and it’s harder to prevent stains. Luckily, this only needs to be done about once every five years. If you feel it’s time for your pool to be drained and refilled with fresh water and proper start up chemicals Pristine Pool Service and Repair can help.