During the filling of sterile beer kegs and bottles, the beer is typically filtered to 0.45µm either with one pleated cartridge or a two / three stage system (typically 5µm > 1µm > 0.45µm). This is for clarification and to prevent microorganisms spoiling the final packaged product.
Beer is stored in sterile tanks, which have 0.1µm or 0.2µm air vent filtration to prevent ingress of bacterial contamination.
Stages of Filtration & Water Treatment
The beer still contains yeast, possible spoilage microorganisms and other particles needs to be prepared for packaging into bottles, kegs or cans.
To help clarification and to protect the final sterile filtration stage, absolute pleated cartridges are used to remove the bulk of the spoilage contaminants.
This stage is known as sterile filtration or stabilisation as the yeast and spoilage microorganisms are removed to prevent refermentation in the packaging.
Storage tank venting
Whether the beer is stored before or after the sterile filtration stage, bacteria removal vent filters are required on the storage tanks to prevent airborne bacterial contamination.
SPECTRUM Premier Pleat Glass Fibre
Cryptosporidium and Giardia cysts as well as other parasites and micro-organisms are removed effectively using this pleated glass fibre cartridge.
SPECTRUM Premier Pleat Polyethersulfone
Bacteria retention rates in excess of log 7 establish the SPECTRUM PPPES range of cartridges as the right choice for final guard filtration in a host of pure water applications.
SPECTRUM Premier Pleat Air Vent
Premier Pleat Air Vent filters have been designed for use with storage tanks and as a vacuum break on autoclaves to allow venting and for removal of airborne bacteria and viruses.