After washing machine use we encountered standing water in laundry room. Roto-Rooter was called and technician cleaned floor drain to no avail. Then main sewer line was cleaned and roots were found responsible some 46 feet out where cast iron was joined to clay tile and further to sewer line in street. After video camera exam we were sold RotoX formulation to be applied to system before retiring for the night. We were told it should be OK for a couple years. We were astounded at the cost for the service but did appreciate the professionalism of the technicians.
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