if your filter is off for a day no your bacteria wont die............... come on be real.
i have done work with ntlabs a well known koi treatment company. they as all the others test there gear in lab's they add the bact and the feed in one bottle why do you think it has to be used by a certain date...... after this date yes its no good. e-mail them if you want and see what they say ..................
are you one of these people that think in winter temps you have no bact in your filter ??????????????????????????????? beware of many myths | 
