TBH, I am having a hard time understanding this. You are making something you inject. You are knowingly using glassware that has build up on it. You are aware of filtering, but don’t do it. At least your using BA and BB, but I think you are skimping on safety here.
Sorry if I came off to strongly there. I just am of the opinion that with this type of thing it is important to be meticulous.
I would try to make sure you don’t get build up and your glassware is for sure sterile. You could buy distilled water to clean with. Or use alcohol to clean and sterilize.
The filtering is a good idea, because you raws might have contaminants in it as well. Or contaminants could be introduced in the brewing process.
I have a buddy that got an injection infection. He was fine, but he still had to go to the doctor for them to drain it. Just try to be as clean and professional as possible, since you are making something that you are going to put in your body.
To ease confusion, I do this because one day I intend to be and I’d rather be extremely well educated about doing so before I do. Posting allows for dialogue and educational purposes for ME and is more educational than simply reading along. I hope it helps others this way too.
The 18/2 vs 20/2 recipes are personal preference, and I think some of it has to dear with quality of ingredients used. I’ve gotten raws from different suppliers and some of them seemed easier to brew than others (less crashy, easier to filter).
If you used 18/2 and your gear hasn’t crashed, then run with it. Ratio of solvents will not create particulate in your gear. What is it that you brewed anyways? Looks tren-ish