I have multiple apartment buildings. Regardless of what you tell the tenants, they pour grease down the drains, scrapings from dinner plates, and even paper towels down the toilette.
A plumber recommended trying Green Gobbler and purchasing it from Home Depot. The first time I did it, it was in a grease plugged third floor unit. It took two applications, but it was running smoothly the next morning. The second and third times were in hair clogged bathtubs (don't know why the tenants don't use the hair strainers I provide), again, two applications and it was running smoothly. The most recent was when a tenant ran out of toilette paper and decided to use paper towels to wipe, and flush. Again, another miracle, two applications and it flushed perfectly.
I now buy in 25 lb pails and do semi-monthly applications in all the apartments. GREAT STUFF!
Bottom Line: Yes, I would recommend this to a friend