If the plunger fails, rent a 1/4-inch hand auger.
Location: Men’s Room, Sector 114, City Football Stadium. Halftime, 45,000 attendees.
Event: A single urinal becomes fully blocked after a user discards a hot dog bun.
Cascade: blocked urinal
Professional plumbers use inhibited hydrochloric or sulfamic acid designed for urinals. The water is evacuated, the acid is poured in and left for 8 hours, and then flushed. This dissolves uric scale completely. This is dangerous for DIY because the fumes are caustic and it can destroy chrome finishes. If the plunger fails, rent a 1/4-inch hand auger
You have tried the plunger, the snake, and the chemical. The water still rises. Call a plumber when: If the plunger fails