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Those LifeStraws have a limited lifetime, about a year from what I can see. That makes your $1.6 billion an annual expenditure, and now you are starting to talk about a lot of money.russ_watters said:The number of people at risk due to poor quality drinking water would be much higher than 5 million, but even if it is a quarter of Africa's billion people, you're still only talking $1.6 billion.