There are certain things we take for granted in life. Water is one of them. Only by using Aqualiv, we deeply understand how enhancing and purifying their filtration process is for our body. Only by examining the expired cartridges on a yearly basis, are we deeply thankful we purchased this item. We've used their filtration system for a few years now and my teenage boys will NOT drink bottled water. The refreshing, clean and revitalizing nature of the water is second to none. This product is not a luxury, it's a necessity in life if you want to maintain or enhance your level of health.