need help

[shmeffrey23]

hi im trying to get a wet dry filter for my 65 gal saltwater aquarium and i found a used one... i contacted the guy and asked him if it was used for salt or freshwater and he said fresh.... what would i have to do to make it usable for saltwater

 

[mr. limpid]

Just a good cleaning if it has bio balls you may want to soak them and check if there is any water scale build up on them.