Instant Power Heavy duty drain opener 128-oz Drain Cleaner at Lowes.com
Which Drain Cleaner Should I Use?
Guide to Commercial Drain Maintenance | Enva
Amazon.com: Liquid Fire Drain Opener 32 Ounce with Centaurus AZ Drain Snake for Commercial Use, Most Powerful, Effective and Works Faster, Clear Clogs from Sinks, Tubs, Shower Stalls, Septic Tanks and Laterals :
Zep Commercial 64 Oz. Liquid Drain Defense Drain Cleaner - Bliffert Lumber and Hardware
Instant Power Commercial Drain Maintainer 1510 - The Home Depot