Hmmm.....
If you want to pit your filter on a different freshwater tank, then yes, that'll work. In fact, lot of people put extra filters on some tanks just so they'll have some already-matured filters ready to go for new tanks.
However, if you want to put your old freshwater filter on a new saltwater tank, then don't bother. It will have to re-cycle all over again, BUT it would be a bit faster.
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