@XKawN is the official European anabolic spokesman. He's halfway through a western Europe tour of speaking arrangements, he'll be able to participate personally soon.
not sterilized has never been a problem from all of my years reading reviews. There are always theories about it, but I can't recall one instance this has caused an issue. The filter obviously takes care of the oils sterility. As long as your oil transfers from the filter to a clean environment you will be perfectly fine imo. If I had to estimate a number, I would guess that I've seen well over 1000 vials used with zero issues with filtration like this.
One thing I would be sure of prior to exposing my filters to caustic substances is what they can handle regarding membrane breakdown. Just something to keep in mind
70% is what you want to use. 90% evaporates too quickly to be very effective at killing, 50% isn't potent enough but lasts on the surface.