For applications where 99 to100% retention of contaminants above a specified pore size is not required, clarifying filters and prefilters are recommended. To guarantee microbial retention, a membrane final filter must be used.
Selecting the proper clarifying and/or prefilter is based on your individual application needs. Our specialists can assist you in determining which filters will yield your desired product quality, be the most efficient and cost effective for your particular application.
Choose filters based on the retention efficiency required for your filtration process as a whole. First, decide on your final filter, and then select your clarifying and/or prefilters. Working this way provides you with the best combination of retention and capacity. By selecting the proper pore size rating, you will ensure the required dirt-holding capacity for your application.
A non-fiber releasing membrane-like prefilter could be used as a final filter. However, the fiber matrix of these filters may occasionally unload retained contaminants into the filtrate if subjected to extreme pressure fluctuations, flow surge, or fluid “hammer.” These phenomena are not uncommon in the high flow/high volume piping systems beverage manufacturers use, and are usually caused by pump on/off cycling, quick closing valves, and other process flow control devices.
In certain cases, it may be more practical and cost-effective to use a clarifying filter followed by more retentive prefilters. This allows each filter in the train to be used to its maximum capacity, removing as much contamination as possible.
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