I have been reading up on fina to tren and I hear people saying just filter with a whatman .22 and that there is no need to bake the oil in an oven because it doesn't get hot enough because of the oil or it doesn't use pressure like an autoclave. Then I read that some people use a pressure cooker like an autoclave so you get heat and pressure. Then some people say that doesn't work either due to the oil. There HAS to be a way that will sterilize it beyond just filtering.
It seems to me like the only thing that could be contaminated is the crushed fina if you are using everything else that is sterile along with usp oil. So why not crush the fina and put that into a pressure cooker or oven? If you can't do that with powder then why not with the BA or BB and add oil after it is in the pressure cooker then filter. or how about adding a lot more BA or some other bacteria killing chemical to the fina (alcohol? or something) than what is needed, letting it sit until any bacteria is killed and baking the solution until the ba/chemical evaporates then you are left with basically sterile fina and then continue the process as normal.