Grout in a line can be caused by the tile guy cleaning his tools in the bathtub after he has done his tile job. Other junk in the lines is usually caused by a careless Plummer not making sure the line is clear before installing them. Sometimes a disgruntled worker puts things into the pipes, it does happen. The superintendents of these jobs should remind the workers from time to time, to take the proper precautions when installing the piping.
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