Degermination methods Filtration

Procedure:
Filtration is known as a physical procedure in water-degermination next to UV-radiance and reverse osmosis. It is a mechanical separation-process.
Filters with open pores with less than 0,3 µ are used in the process which are impermeable for microorganisms.
Use:
Ultra-filtration equipments are used to produce large amounts of degerminated water. Here the separation-process takes place through synthetic membranes or compact-filters with the insert of ceramic filter cartridges.
The filtration process plays a role in emergency supplies, expeditions, single water supply and in the beverage industry. But it cannot be used for public drinking water supply because of economic reasons and the relatively high specific pressure loss in the filtration process.
Disadvantages:
Particals surrounding the filter can be passed to the water if the filter is already fully loaded.
In extreme cases this can lead to higher concentrations of particals in filtered water than in the filter inlet.
Filters offer an excellent breeding ground for microorganisms.
Filters mixed with silver used to avoid microbial growth, inevitably cause a hightened concentration of silver in the filtered water. Furthermore, the growth of silver-resistant microorganisms on the filter is assured.