July 23, 1800: French patent granted to James Smith, ‘Citizen’ Ciuchet and Denis Monfort for an elaborate filtration device consisting of layers of wool, 2 inches crushed sandstone, 12 inches coarse powdered charcoal pressed into a solid with river sand, and 12 inches of sand or crushed sandstone. “In 1800, the basic Smith-Cuchet-Montfort patent was […]

via July 23, 1800: French Water Filter Patent Issued — This Day in Water History