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Here’s how the cost per liter breaks down at 7 liters per day per person

5 People 20 People 50 People

1 Month

$0.04762 $0.01190 $0.00476

1 Year

$0.00391 $0.00098 $0.00039

5 Years

$0.00078 $0.00020 $0.00008