Your pool water is constantly changing, year round. Everything from weather to oils, dirt, and cosmetics affect your pool water balance – in short, anything that comes in contact with your pool water.
You will probably not change the water in your pool for many years. Continuous filtration and disinfection removes contaminants which keep the water enjoyable but this is does not balance your water. A pool that is “balanced” has proper levels of chlorine, cyanuric acid, pH, Total Alkalinity, and Calcium Hardness.