Replacement Cartridge for Premium 10-stage Water FilterNew Wave Replacement Cartridge for Premium 10-stage Water FilterHow Long Does the Replacable Filter Cartridge Last? Each Filter cartridge should be changed after 1500 gallons. This would be approximately one year for a family of four, assuming they each drank 1/2 gal. a day and they wash fruits and vegetables in filtered water.How Does One Change the Replaceable Filter Cartridge? Unlike many brands, the whole system does not have to be thrown away. The housing is simply unscrewed, the old cartridge removed and a new one dropped in.Is the New Wave Premium Filter Tested and Approved? The New Wave Premium 10-Stage Water Filter has been extensively tested. Summary test results are available upon request.