Sta-Clean CS-250 Condensate Drain Treatment, Treats 3 to 5 Ton Units Dimensions: 3/8" x 1-1/2" x 12" HWD (inches) Kills Odor-Causing Bacteria Time release treatment in protective 'sock' EPA Registered & Made in the U.S.A. Replaces Competitor Products: Algae Guard AG8/1.50-H , AG8/1.50-R , AG12/1.50-R , AG12/1.50H , Bio-Klean , CRT Controlled Release Technologies , Dynamic Time-Release Drain Pan Treatments PT3-5 , Nature's Home , PanGuard RC8/1.50 , HC8/1.50 , RC12/1.50 , HC12/1.50 , TR-BioKlean , ServiceFirst , B12-487 , Trane DTR5-1-E , DTR5-6-R and similar pan strips.