They are designed as single-use only bro. You can filter 100mls per though, you should be able to make plenty of homebrew with a few filters. I've heard of people running benzyl alcohol through the filters to clean them, then heating them to sterilize, but why go through all that trouble to not be assured it's sterile? Just buy a few more. Make your gear a little more concentrated too, like 400mg/ml for test e/EQ/deca, etc. A few filters goes a long way bro.