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
__________________ http://www.ukkrazykoi.com The internets fun helpful koi forum. 
1x 3255 gal pond
1 x nexus 300
1x 3kw electro heater
2 many litres of air per minute to count
1x sequence 15000
1x aquamax 5000
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