Underwater Pelletizing Systems (Pelletising) cut a pellet that is fully immersed in water. Some of the advantages to using this system include superior spherical pellets and are more versatile especially with sticky polymers . Pellets are then conveyed as slurry to a centrifugal dryer.

Water ring pelletizers are typically used in polyolefin operations. The pellets in this machine are cut hot from the die. They are then conveyed down a water table to centrifugal dryer. These systems tend to be more economical and are simple startups.