In this study, the effects of large particle in chemical mechanical planarization (CMP) slurry were investigated on slurry distribution system, which utilizes a pumping device to circulate CMP slurry. Three different types of pumps (e.g., bellows, diaphragm and magnetically levitated centrifugal pump) were evaluated their performance such as generation of agglomerated particle and defectivity in different of slurries (Ceria slurry, Silica slurry a, Silica slurry b).