Good question.
And the answer is it depends primarily upon the SIZE and chemical nature of the contaminants.
For instance while the smallest bacteria is about the size of the largest virus both being 400nm
So a filters pore size is extremely
important. In addition there’s a variety of AAS production fragmentation byproducts (from peptides, RNA, DNA or chemical insolubles) othat can pass thru any filter some of which form aggregates often referred to as floters.
Thats not to suggest aggregates are necessarily infectious but rather are simply not consistent with a quality product.
And bc the quality control of UGL raws are questionable folk are better off assuming few if any mail order AAS come close the the quality of Big Pharma.
And for this reason alone, exclusive of ensuring the brewing process was procedurally sound, AAS with floaters, unexpected discoloration, or precipitation etc are better off in the TRASH CAN.
Or return it to your supplier for a full refund
Jim