The Langthwaite Filter House is a house in Langthwaite Road, Quernmore, Lancaster, England.TV plea over building's restoration, Lancaster Guardian (February 8, 2015).Keith Horsfield, Lancaster's Water and Sewerage Systems Part Two: The Pipes, Contrebis, Vol. 30 (2005). Lancaster Archaeological and Historical Society. There is also a filter house in Scotforth.

Restoration of the filter house was featured on an episode of the Channel 4 series The Restoration Man.Lancashire Water Filtration Plant, The Restoration Man, Channel 4 (2017).

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