PROFESSIONAL:Manufactured by Lafedy, who stand behind the quality of filtration and overall performance of our filters! TECHNOLOGY:Lafedy Filters Da29-00020B uses state of the art technology to help remove Chlorine, Lead, Mercury, Cadmium, and Thallium. SUGGESTION:For optimum performance it's recommended you change your filter every 6 months OR every 300 Gallons.(Depneds on water quality and level of contaminants)