It's easy!
Step 1: Place your used cartridge into the original package / box and tape closed.
Step 2: Place an address label on the outside of the cartridge box and send to:
Recycling Center
4603 Todd Acres Lane
Plant City FL 33565-3907
Step 3: Affix First-Class Parcel Postage to the cartridge box and mail back for recycling.
(813) 986 - 6407