ClenAir&reg; PurCool Green &bull; Condensate Pan Tablet # PCG5T , Treats up to 5 Tons This Item Ships FREE! Good up to 5 tons , Lasts up to 6-months Natural 'Green' , Biodegradable Product , Non-Corrosive , Non-Toxic & Environmentally Friendly Helps Prevent Drain Pan Overflows & Foul Drain Pan Odors , Non-Floating / Adheres to Drain Pan Supersedes / Replaces: Green Tablets 61051 PCG5T100 , PC5GT-100 , 61052 , PurCool 'Sock' Strips , Nu-Calgon , NuCalgon and many other Drain Pan Products.