Well u should heat to the powders melting point by placing the beaker, vial,ect. in a pan of water and heat on stove top. The filter is what makes it sterile. It doesn't kill bacteria, the bacteria just cant fit thru the filter pores. After filtering with a .22micron filter it will be 100% sterile. (Hard to believe, i no, i was the same way however i trusted her word.) Never get it confused with a .45micron filter. They are to big and some bacteria will fit thru the pores.
Also, NOTHING has to be sterile b4 the filter. I use grapeseed oil from the grocery store and my solvents werent sterile either.
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