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Filtration of liquids using bag filters is a simple process. The liquid to be filtered enters at the top of the vessel, passes through the filter bag and exits at the base or side depending on the model. Particles are trapped on the inside surface of the filter bag.
To replace the filter bag, internal pressure is relieved, the lid is undone and the filter bag containing the trapped particles for washing or disposal is removed, depending on the sort of filter bag used. The units can be installed in parallel to allow continuance of flow during bag changing or in stages so finer filtration can be achieved.