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Known by locals as the 'Blue Pool' or 'Torwood Blue Pool' This sub-structure has been a local mystery for many years. It is actually a redundant break pressure chamber and valve house, it was built c.1910 and was part of the Grangemouth Town Council water supply from North Thirds Reservoir to the town of Grangemouth. The original Building Warrant for this is held in Falkirk Archive, Callender House, under Planning Dept/Stirling County Council/Local Authorities Group Yellow Series. Where is titled 'Quarter House Break Pressure Chamber'.