The health risks of tap water have long been known, but the price of bottled water often steers people back towards tap water. The answer is water coolers! Water coolers offer inexpensive, safe, filtered water. A water cooler can provide gallons of fresh water for pennies per glass. Tap water is treated with chlorine, a substance known to cause harm to those who drink it. Chlorine is used to kill bacteria and other harmful microbes in tap water, but many people are allergic to it and unknowingly causing their body harm by drinking tap water treated with chlorine. The amount of chlorine varies depending on where you live, but nearly all tap water is treated with chlorine.