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The cheapest water filter per gallon of water is the Big Berkey. It's $300usd and filters 10,000 gallons on one set of filters. So the cost is 3 cents per gallon.
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[–] bulrush ago
The cheapest water filter per gallon of water is the Big Berkey. It's $300usd and filters 10,000 gallons on one set of filters. So the cost is 3 cents per gallon.