Clogged drains are always a problem. They may be only a minor annoyance, that can be dealt with by a home handy-person with a plunger or a snake. Or, the situation may be serious enough to require the intervention of a plumbing contractor. Many emergencies can be prevented, but treating your drains properly and not putting anything down there that should not be there.
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So a wise home-owner will practice good prevention, and be prepared with tools like the plunger and the plumber’s auger. These tools will be enough to deal with many clogs. But serious clogs can cause serious problems, so when things get beyond the home maintenance point, it is best to call in the local plumbing expert. Your qualified professional plumber will have the personnel and the expertise to clear your clog and reduce your emergency to manageable level.