Mitch - there was a thread about that a couple days ago in the main forum ... (
Thread: Black or White?)
I too have heard you shouldn't use ABS. However I haven't really heard a satisfactory explanation as to why. Perhaps it is that sometimes ABS has some kind of antibacterial/antifungal treatment as was suggested in that thread ... I don't know. If that's true then I guess that's a good reason, but I don't know if that's true. Another person said in that thread that ABS is just fine. So I don't really know what to think... I'm just as confused as ever on this issue...