High mass transfer media efficiency, light, big free volume, low pressure drop, high ... The Mass Transfer Media have the advantages of big free volume, low pressure drop, short height ... CPVC, etc.)a. Polyhedral Hollow Ballb. Hollow Ballc. Light Inert Solid EPS Resin BallFeatures: 1) Made of heat ... VSP, helix rings, hollow balls.3) Advantages:a) Big free volumeb) Low pressure dropc) Short height of mass ...