It can be difficult for operators of pressure filtration systems to know what is going on inside the filter cake during filtration, washing and drying, and any miscalculation can result In wastage of time, effort and money However, this may be about to change. Thanks to a UK government funded project, Industrial Tomography Systems has been able to test its novel sensing technique - electrical resistance tomography - for pressure filtration on a commercial scale. Peter Varey freelance writer for Filtration + Separation, presents the major findings of the project.