FLSmidth Tower Mill (FTM) The FLSmidth Tower Mill (FTM) reduces energy and media consumption while minimising water usage in secondary and tertiary wet grinding of minerals. The major design feature of the tower mill is a central agitator screw, the only moving machine component in contact with the slurry and steel media, which allows size reduction by attrition. This arrangement significantly reduces energy consumption in fine grinding of minerals when compared to traditional horizontal ball mills for the same feed and product size.