what would you like us to say...there is 2 choices:
A: buy sterile oil from a lab supply site.
B: buy non sterile oil and filter it yourself.
seems pretty straight up to me. and btw, if you decide to hand filter enough oil to last any real length of time, it's going to take you forever and your hands and wrist will be very sore. there are other ways to filter it which are faster and easier, but it's much easier to help someone who is grateful for the free advice from other who have been down the same road.