The API Filstar XP BioChem Zorb pouch fits both the old Rena (Item
725A) and new API Filstar (108A) canister filters. It is still included
with all Rena Filstar Filters and does much more than activated carbon.
Bio-Chem Zorb is a unique blend of ion-exchange resins, scavenger resins
and activated carbon. This single cartridge will provide effective
chemical filtration and remove the organic pollutants that cause odors
and discoloration of aquarium water. Replace monthly for best results.
May be shipped in either retail or bulk package. Plain Package 18 per
pouches come in other sizes and along with the #6 pouch will fit almost
all canister filters saving you both time and money in maintaining your