A licensed plumber means the person completed the necessary education or training required to work as a professional tradesperson. Hiring a licensed plumbing service means the people working on your building are knowledgeable about water and gas pipes. If you use unlicensed workers, you run the risk of them damaging your home even further and endangering you by doing faulty work.
Don’t flush floss, tampons, or even so-called “flushable” wipes. They don’t break down like toilet paper does and can come back to haunt you later. “Toilets are more water-efficient now than they were 20 years ago, so there sometimes isn’t enough volume in the flush to force debris down,” says Marcin Wroblewski, president of ExpressRooter Plumbing in Toronto. “An object will get lodged in the trap and cause blockage when waste builds up days later.”
The word "plumber" dates from the Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall". Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.