Hi Miguel
the best explanation to why a filter in a purified water loop is a
bad idea is in the FDA GUIDE TO INSPECTIONS OF HIGH PURITY WATER
SYSTEMS where it is stated:
Figure 11 also shows a 0.2 micron in line filter used to sanitize the
purified water on a daily basis. In addition to the filter housing
providing a good environment for microbiological contamination, a
typical problem is water hammer that can cause "ballooning" of the
filter. If a valve downstream from the filter is shut too fast, the
water pressure will reverse and can cause "ballooning". Pipe
vibration is a typical visible sign of high back pressure while
passage of upstream contaminants on the filter face is a real
problem. This system also contains several vertical drops at use
points. During sanitization, it is important to "crack" the terminal
valves so that all of the elbows and bends in the piping are full of
water and thus, get complete exposure to the sanitizing agen
have a nice day!
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Sofiane
salah-sofiane.naili@coteba.com
COTEBA Dev
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