This work discusses dewatering of CaCO3 suspensions in the presence of a dispersant (sodium polyacrylate). Suspensions were dewatered using the rotating disk-aided dead-end dynamic filtration technique. Dewatering efficiency was studied as a function of the dispersant content and operational parameters (disk rotation speed, filtration pressure). Two dewatering modes, with initial (i-dewatering) and delayed (d-dewatering) dispersant addition, were tested. For concentrated suspensions, the d-dewatering allowed higher final dryness and better fluidity than i-dewatering with minimum dispersant losses in the filtrate.