Customer called about a hall toilet back up toilet was already removed and floor was covered in water on arrival. I inspected the basement water seeped through floor, there was water on the floor in basement. Assessed the issue it was a clog in her main drain line. Ran 400 machine through hall bathroom toilet drain and cleared blockage. I tested the drainage by running water through the tub, no sign of back up. I cleaned the remaining water from the floor. Did not reset toilet as a drain supervisor is coming to camera line. Water pressure was 50 psi and water heater was 14 yers old.