Clogging occurs in confined flows through three main mechanisms: sieving, bridging and adhesion. Microfluidic platforms facilitate isolating and investigating these mechanisms. The simplest involves single particles sieving into constrictions of approximately the same size as the flowing particles . Clogs can also form by bridging in larger constrictions . Here, arches of two or more particles form across the width of the constriction, stabilized by force chains . Bridges are formed when multiple particles attempt to navigate a constriction simultaneously. Flow stoppage due to bridging occurs in both dense and dilute suspensions. Both particle volume fraction and constriction width determine the probability of bridge formation. For particle volume fractions near the jamming fraction of ∼60% and as low as 0.5% , steric effects are sufficient to cause both sieving and bridging. Up to five particles participate in a bridge, in both constricted granular and suspension flows . Clogging can also be induced by attractive interactions between the particles and the pore walls . Clogging by deposition can be induced or prevented by surface treatments of the channels walls . Increasing the ionic strength of the suspension, for instance particle dispersion in NaCl solution, can induce inter-particle aggregation and wall deposition .