In comparison, a much deeper biofilm could fill the crevice of an o-ring joint. These areas of deeper biofilm growth can have more corrosion problems and are harder to sanitize. Aerobic bacteria near the outer surface of a biofilm consume oxygen. If biofilm is thick enough, oxygen will be depleted at the pipe surface creating an anaerobic zone. These zones inside a stainless steel pipe can cause corrosion.
Anaerobic zones are most likely to occur in crevices at o-ring pipe joints and threaded fittings.
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