Efficient filtration of tailings is essential for dry stacking and water recovery, but slurry variability, especially in particle size and mineral composition, can impact filter performance and cloth durability. In partnership with an iron ore mining company in Brazil, Valmet analyzed tailings samples collected during periods of reduced filtration efficiency. The study found that slurries rich in alumina and micaceous minerals tend to retain more moisture and clog filter fabrics, reducing cake permeability. These findings reinforce the importance of selecting filter fabrics based on the specific mineralogical and morphological characteristics of the slurry to improve performance and support dry stacking strategies.