The B. David Company is a second generation family owned business specializing in the development of new water purification technologies, which are then incorporated in durable, field tested, easy to use residential systems. Our product can be found in 100+ countries and at many United States and British Embassy / Consulate compounds and residential units. Quality, quality, quality...If you are looking for a cheap mass marketing water filtration system, this is not the place for you. We are not the most expensive system on the market, but we will never be the 'internet' low cost leader. Our systems are not sold as a commodity item or by national multi-level companies that utilize dozens of part time distributors. Our residential systems and filters are produced by only NSF inspected United States based factories. We offer the most efficient system for your money, using the longest lasting components and market leading technology. Our systems will pay for themselves over time AND keep you healthy.