personally I have never had any problems with QV but I have moved on to doing my own homebrewing for the very reasons you are asking about..
If you are nerveous about it, then filter it.. use a .20 um filter not the standard .45 and you would get it even cleaner.. on another note, it is going to be a bitch to push through.. also, I wouldn't add anymore BA because most of the vet gears have a little much already