Lol you're assuming a lot about me but that's cool. Let me ask you this, if you're going to be injecting something into yourself, would you rather think too much or too little?
.45 gets out the particles....agreed
.45 does not do a good job of removing spores and certain pathogens....agreed
But you're wrong that BA gets out the spores or pathogens. BA will just kill them off, which is a good thing, it won't remove them from the solution. A .22um filter will remove damn near everything and the BA would then be your fail safe.
I've done 150ml of oil in under 25minutes before and that includes the time spent watching some tv during bc I'm not required to sir there and stare at the filter for 20min while it's doing it's thing. That's why I bought a vacuum pump for.
I couldn't care less what other UGLs use as a filter, I'm not using their products, partially for reasons similar to this. BTW I can think of 3 labs off hand that do use .22um filters and there are more.
If an extra 15min or so of time spent filtering your oil with a .22 filter vs a .45 filter is that much of a problem for you then It seriously puts your knowledge of sterilization into question.
The issue isn't whether you can see spores getting into the sample or not. The issue is we don't work In clean rooms. I've read stories of people brewing in rooms around pets, or with windows open, or with A/C units on....sterility is an afterthought for most when it comes to this shit so whenever you're presented with an opportunity to follow recommended practices you'd be best advised to follow them. .22 effectively removes more than a .45. A .22 is required by the Department of Health, pharmaceutical companies, compounding pharmacies, etc for most sterilizing protocols (some require even more filtration) not a .45. So I'll take "you've been brewing since i was in diapers" and I'll raise you This is coming from my cousin who is a PharmD and has worked for a pharmaceutical company and is now one of the head Pharmacists at a hospital in my state. Does your background include medical or pharmaceutical experience?
You can see the clearance rates of various types of bacteria in a .45um filter vs a .22um filter here:
View attachment 18190
As you can see, a .22 filter does a much better job removing bacteria and spores than the .45 which is why it's used as the standard when it comes to filtering most injectable preparations.
If you wish to take shortcuts for your own brews in the interest of saving yourself a little but of time, go right ahead. That is your right. But if you wish to advise others of taking these same shortcuts and not make them aware of the risks then you will be called out on it. Plain and simple.
Hopefully others haven't wasted their time understanding why it's always best to use a .22um filter.
