Bacteria kept in liquids will not stay in spore form long. Refrigerating bacteria will slow their growth, but will not stop their growth as is demonstarted in the quick shelf life of less than 1 week for most products stored in a refrigerator.
Perhaps Seachem knows something you don't..
What makes
Stability so unique is that we have found a way to keep
the bacteria in a dormant spore state within the bottle,
allowing them to remain inactive until they are put into
the aquarium. Once in the water, the inhibitor is diluted
and the bacteria become active to begin working
immediately. This means that unlike competing products,
Stability does not need to be refrigerated and has a 4
year shelf life! Other products need to be refrigerated
because they are trying to prevent their bacteria from
becoming active within the bottle and potentially dead by
the time they are put into the aquarium. Fish can be added the
same day as Stability and they will not suffer from
ammonia toxicity as long as dosed according to the
instructions on the label! Another great aspect is that
it is an extremely safe product and there is really no
fear of overdosing. You can even pour it directly onto
your biological media (such as Matrix) for an even quicker
jump start of colonization. Other strains of bacteria
only operate under a very narrow range of parameters (pH,
temp, organic loads, etc.) and when these parameters
crash, so do the bacteria. The bacteria in Stability will
operate under a very broad range of conditions and when
other bacteria are dying off, the bacteria in Stability
are working and growing much faster! Stability should be
used not only for cycling a tank, but as regular
maintenance when doing water changes, adding fish, or when
medicating. This will ensure that you keep the balance up
between organic load and bacteria.