0.2% BA is enough, 2% is usually overkill. 5% is way to much bro
You probably got a PES filter. Next time get a PVDF bottle top filter! I really recommend you filtering your gear. It takes such little effort and minimizes the risk of you hurting yourself.
What I've read, BA only stops bacteria from growing/reproducing, it doesn't kill spores. You can inject some really bad things if you don't filter your gear.
Alcohol in general is just a disinfectant, google and read about it.
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