When there is a sewage backup or slow drain situation in a home, we do a site inspection to analyze the situation before devising a plan of action. For example, which drains are slow or backing up? Is it just a single drain having problems? If so, then the clog is probably in the individual drain lines, not in the large, central house drain or sewer lines. If many drains are involved, then we look for which drain lines these affected ones have in common, and assume the clog is in that larger common line.
Are there available cleanouts which would make for easy access to the drains? Although cleanouts are required by code, older homes usually do not have cleanouts (unless updating drain or sewer work has been performed).
After the preliminary walkthrough inspection, we decide which drain to enter with our equipment. We need to do a Sewer Camera inspection to see the condition of the pipes, and to locate and analyze the nature of the clog. So at this point we are working towards getting our Sewer Camera down into the affected pipe. We NEED to know what we are dealing with BEFORE we go off on a tangent attempting to clear the clog.