First Tower was built with the help of Bemix Elementfogbruk Extra large bag, Bemix 310 grout and Bemix A3 as there were high requirements for strength above 60 MPa. Due to the high requirements of 60 MPa for the second tower, they molded around the prefab walls and poured with Bemix A3FF as it was winter time. Bemix grout 310 was also used.