This example shows that the performance of scrubbers is only as good as the droplet separator. The performance of the filter depends also on the selection of the filter medium. More than 20 filter media were tested over a period of several days. Currently, it is too early to define guidelines for the selection of the filter media. Both needle felts and nonwoven fabrics can be used. Filter media equipped with a membrane, however, led to high pressure drops above 100 mbar and cannot be recommended.