ive got a thought...dont use sachets
on a serious note though try adding 3% BA refilter through a .22 filter,then tyndalize and allow to sit for 7days,if that doesnt work then nothing will
why would you suggest adding BA when you have no idea how much is already in it? If you are using sachets just make sure you are filtering through a .45 into a sterile sealed vial and youll be fine.