During the rule of the Ottoman Empire, administrators used filtration machines for Muslim travelers observing the Hajj who had to deal with a lack of water and cholera.
And Health officials admit they are worried about the timing of this, next month more than 2 million Muslims from all around the world will gather in Saudi for the annual hajj pilgrimage.
So there was this king Mansa Musa, who ruled the west African empire of Mali, and in 1324-ish, he left his home and made the hajj, the pilgrimage to Mecca.