ABSTRACT
The point of filtration is to separate particles from a fluid before sterilization. A variety of measurements are employed to judge the clarity of the fluids. Those measurements are used to compare a filtrate to the feed stream as a way of measuring filtration efficiency, which is discussed in Chapter 6. Moreover, some fluids, such as parenteral liquids, must be free of particles or nearly free. This chapter addresses the often misunderstood subject of particle-size distributions in fluids.
