Hello,

I obtained a weird result in my sterility test (with Steritest closed membrane filtration system).

I would like to ask if have you ever observed microorganism growth as a flat dark spot on filter in canister filled with FT=thioglycolate btoth. Medium over the filter is clear. I wonder if it could really be a growth of some kind of anaerobic microbe or an artefact or some kind a reaction of filter and product tested..?

Thanks in advance for any suggestions

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