Use the Google keyword tool and type in the name of your product or service. For example, if you are a plumber, type in "Plumber". Google will then list all of the words (aka keywords) that people type in to find a service like yours. You might see common variations like "Plumbing Expert", "Plumber Services" or "Pipe Plumber".
Do not ignore an out of service toilet if you have a business as if this problem persist you may end up moving your business at a different place. Such out of service look unprofessional and sloppy at the same time. This may really affect your business.
Good plumbers are going to have a valid license that you can check on. Look up the number they give you online and see if it is valid and if any complaints have been filed against that number. This will tell you if they are at least good and have not done anyone anything wrong. Some of the best plumbers are going to know and understand the local building codes and will be able to explain to you what is needed bathtub repair for the job to be in code.
A Trustworthy plumber will answer all of your questions. Good plumbers will provide you with references, and tell you how long they have been a plumber, and the type of guarantee they provide for their work (warranty.) As well, a professional plumber will offer emergency service for nights and weekends. You should be able to make contact with him or her in a timely manner. A professional plumber will also have all of the appropriate insurance such as liability insurance so that you are protected in the event of an accident.
Now to prevent clogs from happening, you would need a drain cover in order to stop the clogging. However bear in mind that sometimes the best idea is to simply call your Local plumber and have them come out to take care of the clog. It is simply the more financially responsible as well as reasonable. Plumbers have equipment that the standard homeowner doesn't in order to clear the drains quickly and get them flowing again. Just remember that you have to be specific as your plumber is not a mind reader and cannot diagnose on vague information.
Before you hire a plumber, ask questions. Find out what kind of experience they have and if they offer service 24 hours a day. You can prevent many problems by fixing a plumbing issue before it gets worse. You should also find out if the contractor is reputable and check their references. Compare plumbers until you find one you can trust.
Even if you have not noticed a problem with your sewer lines, consider calling in a plumber for an inspection. If there is a problem, set up an appointment to have it repaired right away. Remember that replacement can be costly but you can save money by going with a company that will avoid trenching the yard.