New Wave Enviro Premium 10 Stage Countertop Water Filter Replacement Cartridge is a for New Wave's Premium 10 Stage Water Filter. The long lasting cartridge is unique from other brands. If any filter is not changed properly, it will dump contaminants into the water at concentrations higher than the original tap water. If the filter warranty card is returned, New Wave Enviro Products will send reminder postcards when it is time to change cartridges. It lasts three times longer than other brands! 1000 gallons longer than the leading competition which is only 500 gallons!