These filters use the concept of pressurized liquid filtration. The filter vessel in corporates a simple opening system which allows the change of filter bags to be completed quickly so that the vessels are out of use for the minimum possible time. the product to be filtered passes through a filter bag from inside to outside, solid remaining in the filter bags. High Flow rates can be achieve using filter bags. They are extremely durable and are also available in various needle felts, nylon mono-filament mesh bags, etc.