In the final or polishing filtration step, there is a need to remove any chill and oxidation hazes as well as remove micro-organisms thereby enabling the required degree of biological stability to be achieved. For lager beers which are filtered and then pasteurised, Carlson's XE200H has been developed to provide an excellent degree of polish whilst achieving high flow rates. For beers which undergo aseptic or sterile filling, high levels of biological stability are required. For this duty, Carlson's XE675H is ideal due to its carefully controlled pore size distribution.
In recent years, long term beer stability has become more and more important. In particular, achieving the required stability levels in lighter flavoured and coloured beers is a particular challenge. After extensive research into this issue, Carlson has developed a special, stabilising filter sheet, PROP4, which is carefully impregnated with polyvinylpolypyrrolidone (PVPP).
By processing beer through this sheet, excellent stability against chill and oxidation hazes can be achieved as well as by removing a proportion of anthocyanogens.
