Bleeding

The term turbidity run refers to the initial phase of a filtration cycle in which the filtered medium still appears cloudy. At this point, a complete filter cake has not yet formed on the filter fabric; the open pores allow fine particles to pass through, so the filtrate stream contains an increased amount of solids. Even in continuous processes, short turbidity phases can occur – for example, after backwashing or when the cake breaks. For many applications, especially in food and pharmaceutical production, it is important to discharge the turbid phase or return the turbid filtrate to the feed to ensure product quality. Through appropriate process control, such as monitoring turbidity with inline sensors, the transition from turbidity run to clear run can be detected. GKD offers filter belts and fabrics with optimized mesh geometry that enable rapid cake formation and thus reduce the duration of the turbidity phase. A short turbidity run increases efficiency, reduces valuable product losses, and supports consistent filtration performance.