My final count is over 30% of the vials - can't say exact % because of OPSEC* - contain at least 1 strand of contaminant. I'm almost positive it's filter material not hair or insect legs or anything gross like that.
@TripleBSolutions In the interest of helping your future customers since you seem intent on hanging on, walk us through your filtering process. Something is wrong there. I don't brew but from what little I've read, you should run a waste batch of oil through the filter first before you run your gear. This ensures that loose filter material gets flushed out. Do you do this? When you have the time, please fill us in on the rest of your process in detail. Not saying this to be a dick, but if you have a fault in your process, someone will chime in. This will help you make better, cleaner product.
As for your visual inspection. Clearly it's not very good or I'm too good. I don't know the iso standard, but my process is the following:
Peel off label and remove glue residue with alcohol.
Turn off the lights
Wipe with 90% alcohol that flashes off quickly without streaks
Place on a 600 lumen mini flashlight**
Examine from different angles.
If unsure if interior or exterior, twist rapidly and stop abruptly. Anything inside the vial will keep spinning.
Using this method I can find particles that I couldn't otherwise in a normally lit room with an phone flashlight.
Such as this new floater which I initially missed under normal lighting.
https://ibb.co/4gwSyS3
https://ibb.co/LZzzHy8
FYI, I picked this forum because I like to read and many vets here like to read. Journal articles, industry handbooks, etc, you name it. You're not dealing with 'normal customers' and standards that are good enough for naive high school kids and beach juicers don't pass here. Rise to the occasion.
Like this? https://ibb.co/0Xfc2xk
Not very interesting and I can't see any floaters like this.
*See how obnoxious this is Trip?
**https://www.amazon.com/LUMINTOP-EDC-AA-Flashlight-Compatible/dp/B08L9FHBM8/ref=pd_sbs_6?pd_rd_w=tiQOq&pf_rd_p=527ea27c-adf6-4b67-9c5f-265eb29e0622&pf_rd_r=ZBCHE6RP4G9JJEE137YZ&pd_rd_r=e3af72ab-e8e7-4877-b4e0-d632bd1a4db3&pd_rd_wg=k1Msc&pd_rd_i=B08L9CYCGL&th=1 (This one is decent)