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This work studies the advent and diffusion of water filter usage in Sao Paulo State, during the 20th Century. The water filter, a set of two terracotta vessels equipped with a filtering device, was a product of the ceramics industry, one of the first to be developed in Sao Paulo. This research shows that in Sao Paulo at the end of 19th and beginning of 20th Centuries, with the growth of cities and rapid urbanisation, a concern about the quality of water increased due to serious public health hazards, mainly epidemics caused by the consumption of unhealthy drinking water. Despite the existence of an incipient market of domestic equipment for water filtration, these were imported and of limited usage. From the 1910's, ceramics companies, owned by Portuguese and Italian immigrants, started installing filtering devices in terracotta vessels, launching the water filter set. It caught on and became the main domestic filtering equipment after the 1930's, when several companies specialized in this kind of product and started catering for the national market, such as Filtros Salus (from Sao Paulo city), Pozzani (Jundiai) and Stefani (Jaboticabal). Studying the advent and diffusion of the water filter entails knowledge about one of the first consumer goods of the Brazilian industry and, at the same time, knowledge about the history of the ways in which the Brazilian population obtained water to drink.

Água de beber: a filtração doméstica e a difusão do filtro de água em São Paulo