Located at Runcorn Site, the ACS plant uses the Bertram process to produce anhydrous caustic soda in prill and solid drum form. The plant was built in 1985 and has a nominal capacity of 125kTe/year with 80% of the product as ‘prill’ and the remainder as solid 400kg drums. Typical feedstock rates based on normal operating data were of the order of 15te/hr, 50% caustic soda, and 1300m3/hr natural gas.