Compressed chlorine storage at the INOVYN ChlorVinyls Limited Rocksavage chemical works. This plant mainly produces chlorine, caustic soda and chlorinated derivatives. I believe that these spheres are no longer used.

The signal was once used to control vessels using Weston Marsh Lock which links the Weaver Naviagation to the Manchester Ship Canal. The Weston Canal running across the image linked the Weaver to the docks at Weston Point and also the now derelict Runcorn and Weston Canal.