I always keep my water ram around but almost never use it, takes up valuable space on the truck but when you need it...you need it. I went to a laundry drain call and what do I see.... a lead y with s trap going into the cement floor no cleanout and cross strainers so small not even my sink snake cable with no end will go thru. Busted out the water ram, a raincoat, and a prayer...bam flows great! I didn't even charge as it is for a good customer that builds a lot of homes and rough in's are kinda rare now days around here.
I did explain it can back up again anytime and it should be updated in the future.