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What is the filter service life

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Waterdrop Alkaline Water Filter, Replacement for Berkey® Gravity Water Filter System Carbon block } } @media screen andG3P600 RO System G3P800 RO Filtration System K6 Instant Hot RO System D6 RO Filtration System G2P600 RO Filtration System K19 Countertop RO System Need Installation Flow Rate 600 GPD 800 GPD 600 GPD 600 GPD 600 GPD 75 GPD Pure to Drain Rate Drain ratio stands for the ratio of wastewater and purified water dispensed by a RO system. For example, the 3: 1 drain ratio means it uses up a gallon of wastewater for every 3 gallons of pure water you get.