A. All drinking water filtration systems are not created equal. Quite simply, Multipure offers a superior product, and it costs more to design, test, and manufacture a high performance product. There are many drinking water system choices available to you, and at first glance they may seem comparable. But they are not. Even among companies employing solid carbon block technology, which was first introuduced, used and innovated by Multipure, they do not match the proven performance of our products. You gain the cost saving over time after investing in a “lifetime guaranteed” Multipure drinking water system through the low cost of the replacement filters that average $70.00 for 750 gallons or $0.09 per gallon. Superior performance equates to a better value for you over the life of the product, and it gives you the peace of mind and satisfaction of knowing you are making a safe choice.