A new process for purifying the waters supplied to the Metropolis by the existing Water Companies: rendering each water much softer, preventing a fur on boiling, separating vegetating and colouring matter, destroying numerous water-insects, and withdrawing from solution large quantities of solid matter, not separable by mere filtration / [Thomas Clark].

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A new process for purifying the waters supplied to the Metropolis by the existing Water Companies: rendering each water much softer, preventing a fur on boiling, separating vegetating and colouring matter, destroying numerous water-insects, and withdrawing from solution large quantities of solid matter, not separable by mere filtration / [Thomas Clark]. Public Domain Mark. Source: Wellcome Collection.