Consequently, pad type filter assemblies are expensive. However, when large quantities of wine are filtered, the depth type filter pads are quite economical. Practically all commercial wineries use pad type filters. Cartridge Filters Cartridge type filters consist of filter materials made in the shape of a hollow cylinder. The cylindrical filter cartridge is housed in a plastic or stainless steel container.
Wine flows into the housing and through the filter cartridge from the outside to the inside.
After passing through the filter material, the wine flows out of the housing. Both depth type filter cartridges and membrane type filter cartridges are available. Cartridge type filter housings made of plastic are used extensively for domestic water filtration. These plastic housings are made in large quantities, and they are inexpensive. Filter systems can be built from inexpensive plastic housings simply, so home winemakers often use cartridge type filter assemblies.