I think its the same thing as whisper ....
you just need to determine which size
it is.....
I have 3 whisper 3 filters,, i get my filters
from big als or that pet place..... a box
of 24 for 11 bucks.. or something like that.
the filter I have takes the regular size filters....
their is another that is bigger that fit the
whisper 4 and 5.....
They have both top fin and whisper at the lfs,
just compare the filters....
