One, are you sure the "Black Particles" are from the
juice?
We have all had such tiny particles come from eather the atomizer or the caseing, we are not sure which.
There was a thread on it in here somewhere.
Two, I ran the Old
juice I had through a Coffee filter, i turned it into a Cone, and stuck it in a spare dropped bottle i had. It seems to work fine, I didnt have any more problems with gunk, that i could tell, after filtering it.