ok, i posted before and didn't get any usable info... so im postin again. I have some test500 and eq 500 that accumulates black "mold like stuff" in the bottle on the glass when it sits for a couple of weeks. I dodn't know what it is... i have told that it ok and i have been told that it is very bad.... so i don't know what to think. I emailed the source asking him about this twice (once a month or so ago, and the other this week) and i got no reply. I can tell you that i get sicker than a dog when i shoot it( which is why i quit taking it way back when). I was going to throw them away, but iwas wondering what i can do to salvage them if they are fucked up. do i need a filter?