thanks dirt, my thoughts as welll.
Ansel, your pointing to a method that I was also thinking of... do a run with the 25, then at least another run with a larger screen. If the 25 micron is used, there has to still be some that doesn't pass through...
I'd get at least 2 batches per run, but the first run will be the head stash, the rest can walk out the door I guess.
*Found and article this morning that trichomes are in the 4-5 micron size, so the 25 should do the trick if it's packed and loaded properly with a good soak... will definitely be doing other runs to see what comes of the 150 or lower screens after 1 run.
I'm a bit confused by this post, and honestly not sure that you understand how BHO works..
First, bulbous trichs are around 15 or so microns, but the 2 different capitate resin heads are between 50-100 microns in size.
Which is why you can catch them with a 33 micron screen for bubblehash.
And I apologize if you know this already, but based on your post I cant honestly tell... with BHO (or qwiso) you are rinsing the oil out from inside these resin heads, you dont want the actual resin head itself, just the oil inside it. Think of it like this, imagine the resin head was a jar of honey. You're just taking the honey out of the jar. You dont want the jar. People who make bubble hash pres a bunch of jars of honey together. BHO, Shatter etc... Is just the honey.
So screen size Should be less than 10 micron if you want to filter all the resin heads out and be left with just the clear BHO. But like Ansel suggested it's better to do a stacked filter so the butane passes through increasingly small filters as it leaves the chamber. Prevent it from clogging up with plant debris.