Ace Pelizon Plumbing cabled bathtub drain and pulled back excessive hair. Tested equipment for proper function. Line is clear. Sold a bottle of bio one and applied to affected drains. Sewer smell: upon arrival and inspection there was no smell at the moment. Customer stated it smelled like rotten eggs. I inspected sunder the home where there was a previous issue and no signs of sewer spill. A bottle of bio one was sold and treated drains. Had customer monitor the smell from here on out. Next step would be to conduct a smoke test.