Katadyn makes a filter system like the Berky. If they say the filters will do 6000 gal. I wouldnt believe it. Maybe with tap water. the only water we intend to use will be dehumidifier or rainwater. And then use a Brita or make a larger activated carbon filter. Our primary water source is lake water filtered an treated. Ugh for taste and floride. Even in its natural state we try to avoid it. Since Fuku we’ve pretty much used distilled water for cooking and drinking. Cost is relative.