Reverse osmosis is one of the most commonly used drinking water purification processes. The Aqua Sphere Classic reverse osmosis provides fresh, clean bottle quality water. No need to carry heavy bottles. No figuring out where to store the bulky bottles. No more running out of drinking water before the next delivery date. There are many undesirable contaminants that can be present in water. If you want healthy, great tasting drinking water you need to remove them. A list of the contaminants removed by the Classic Reverse Osmosis is provided above so you can see what won’t be in your water. This way you know you have clean water to drink no matter who supplies your homes water supply.