The mill was used to produce flax, then hemp and latterly, rope. Local rumour has it that the mill supplied rope to the White Star Line and most notably, Glasshouse rope was used on the Titanic. When the railway was opened in the valley, it was used to transport coal into the millworks to provide additional power other than that made by the waterwheel.
The mill initially produced flax and hemp, later transitioning to rope production. Local tales suggest that the mill supplied rope for the White Star Line, particularly notable is the use of Glasshouse rope on the Titanic. The railway's construction in the valley provided an additional source of power for the mill by transporting coal.