• Density: 57% w/w or 105 w/v
   
• Is half as viscous as Polibar and therefore flows easily
   
• However, may cause ‘caking’ if procedure takes long or if colon has a large amount of retained fluid.

Polibar

• Density: 55% w/w or 100% w/v
   
• More viscous and may require warming to body temperature before administration
   
• Better coating especially during long studies