I made a thread on this and not only old school guys but also @Dr JIM said there is no need in using the filters.
Well at least there shouldn't be a need to re-filter a product that has already been appropriately filtered.
The latter has been my experience on the few microbial assays I conducted, which has been confirmed by the testing performed by Anabolic Labs IMO.
Those who believe otherwise would be better off locating another "UGL SOURCE" since additional filtering is more likely to CONTAMINATE an already "sterile" (or close to it)
product.